Hello, and welcome.
To become a TSA Precheck approved traveler, you need to apply for the program, preferably online and then be approved after being fingerprinted and presenting official identity documents at an Enrollment Center, to complete your registration. The fee for TSA Precheck is $85.
Please see all necessary information at the following site:
Click on the necessary links, follow directions and you can start the application process.
If you do any international traveling, as well, it would be worth it, monetarily, to apply for Global Entry (GOES) instead, because it costs only $15 more than Precheck and includes the Precheck program, as well. Here is information to begin the online application for GOES, if you choose to do so:
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I'm just checking in with you to see how everything is going. I hope all is well!I hope you found my answer helpful, and if so, please let me know. If you need any additional information, please simply click 'Reply' and I will be glad to help you further.I look forward to hearing back from you and/or receiving a positive rating, so I may receive credit for my assistance.Many thanks!Cher