Like most states in Texas you register when you apply for your drivers license… after all that is in the system you can submit your ballot by mail application.
In irder to be allowed vote by ballot you need to be out of the county of residence you are registered to vote in.
The one thing i dislike it that you dont register at a Rep,Dem or Ind but when you submit your absentee application you have to tell them if you want to vote in the Rep or Dem primary.
I recently in new york registered as an Indepdent in New York and just skipped that section when i saw only 2 choices…i also msised the part in the instructions saying you MUST select one.
The nice thing is Texas seems to be technical advanced.. i got an email from the election board notifying me of my mistake and telling me i can resubmit by email or fax.