Are you trying to figure out if you are eligible to register to vote in New York State?
yes
To register to vote in New York State you must be a U.S. Citizen, be 18 years old by the end of this year, not be in prison or on parole for a felony conviction, and not claim the right to vote elsewhere
I fit all of those, so how can I register online?
Yes, to register to vote online you will need your NYS Driver License, Permit or Non-Driver ID, and Social Security Number
are there other requirements that may come up as I'm registering that may keep me from getting registered successfully?
You can look at the full voter registration requirements listed on the New York State Board of Elections website so you get no surprises
will I be able to make changes to my info so it is up to date?
If DMV's records do not reflect your current name or address, or date of birth or gender, you must first correct this information before processing an online Voter Registration Application
how do you do the signature online?