Go in person to one of the following locations:
Noonday Community Center 16662 CR 196, Tyler, TX 75703
Lindale Masonic Lodge 200 Margaret Street, Lindale, TX 75771
Whitehouse Municipal Court 311 E. Main, Whitehouse, TX 75791
Heritage Building 1900 Bellwood Rd. Tyler, TX 75701
Smith County Annex 200 E. Ferguson, Suite 500, Tyler, TX 75701
Or you can go to http://votetexas.gov, and follow the instructions to register to vote, then mail your form in to one of the locations above.