You will need Acrobat Reader to access a PDF.
It is freeware available from Adobe:

PDF files can be opened or downloaded to your computer.

Forms can then be printed and filled out to mail.

The TLA mailing address is:

Texas Library Association
3355 Bee Cave Road, Suite 401,
Austin TX, 78746

Call the TLA office if you are unable to use this process and need a copy faxed to you: (512)328-1518.