UPDATED 11/7/16: The time has come--in less than 24 hours, polls will open for this most important of presidential elections, one which will define the America we live in going forward. If you haven't already cast your vote early or by absentee ballot, here's what you need to know for tomorrow.
FIND YOUR POLLING PLACE
Where exactly do you need to go to pull the lever or punch the ticket or write in the name of your cousin's dog's name as a principled but futile stand against The Man? Google is here to help. They've got a handy widget, embedded below, which will spit out your polling place when you enter your address. You can also go to Vote.org to double-check and find a list of links to each state's locators. Vote.org also can show you which candidates you'll be choosing from on your ballot tomorrow.
FIND OUT WHAT YOU NEED FOR ID
Voter ID laws vary widely and wildly from state to state. Rock the Vote has a handy state-by-state breakdown of identification policies, what kinds of ID are needed or accepted, and any of the particulars around the process (for example, in some states only some first-time voters need to provide ID).
IF YOU STILL HAVEN'T, REGISTER TO VOTE--BUT ONLY IN THESE 13 STATES
In most states, the deadlines for voter registration have long passed, but there are still thirteen (and D.C.) that allow residents to register up to and on election day. If you're in Colorado, Connecticut, District of Columbia, Idaho, Illinois, Iowa, Maine, Minnesota, Montana, New Hampshire, Wisconsin, and Wyoming, you can get your name on the rolls the same day you vote.
North Dakota is the only state that does not require registration.
FINALLY, DOUBLE CHECK IF YOU'RE ALLOWED TO TAKE THAT BALLOT SELFIE
As Justin Timberlake learned, much to his dismay, documenting your civic engagement with a celebratory selfie is not an inalienable right--and is in fact illegal in several states. Time has a helpful color-coded map that highlights where documenting your vote is banned, and where you can let your Snapchat flag fly.
Today's National Voter Registration Day, and after last night's first presidential debate, it's clear that casting a ballot on November 8th will be one of the more important choices you make this year. Whether you're with her or somehow still find the Trump campaign appealing (really?? anyone?), make sure you're registered and ready to go to the polls come November.
If you haven't already, go and REGISTER to vote in your state. There innumerable places and organizations ready, willing, and able to help make the process as painless as possible (particularly for the millennial generation), including the OG of registration organizations, Rock the Vote. If you're not sure of your status, you can also double-check whether you're registered or not, either through their tool or by scrolling down and clicking the link to your state government's portal.
If you're unsure of how much time you have left to get your name on the voter rolls, check out this comprehensive list from the New York Times that gives a state-by-state breakdown of the last-day deadlines for registering in person, by mail, and online (for mail, date is the day your registration must be postmarked by). The very earliest deadlines are 30 days out from Election Day--October 8th--and a handful of states (and the District) allow in-person registration on Election Day itself.
You're registered, you're ready, and that's half the battle. Now where do you vote and what ID do you need to make sure it counts? Vote411.org's easily-navigable list of polling information has a section linking you to each state's polling-place location tool. (New Yorkers, for example, can plug their address into this NYC Poll Site Locator and find out where to go to pull the lever.) They also provide information on whether and what kinds of ID you'll need to show at the poll, and hours polls are open for each state.
For those for whom scrolling through a long list and reading sounds awful, The National Conference of State Legislatures has a handy-dandy color-coded and interactive map of current state ID laws.