Follow these steps:
Print and fill out this Homestead exemption form for Texas (This form is acceptable in any county. Some counties supply their own form. Both serve the same purpose and both are equally valid.)
If you think you filed a homestead but just want to make sure it is in place. This video shows how to verify your homestead exemption status.
This video covers everything you need to know about Homestead Exemptions in Texas:
Where to mail your homestead exemption forms:
Tarrant Appraisal District: 2500 Handley-Ederville Rd, Fort Worth, TX 76118 Phone 817-284-0024
Denton Appraisal District: PO BOX 2816, Denton, TX 76202 Phone 940-349-3810
Dallas Appraisal District: 2949 North Stemmons Freeway, Dallas, TX 75247 Phone: 214-631-0910