When i bend my thumb they get locked in place and when release, they make a pop or crack sound. i use computer a lot. do i have trigger finger?

Could be: This does sound like triggerfinger. Hard to definitely tell you without examining the thumb. But the description you wrote is reasonable to consider triggerfinger as high on the differential diagnosis list. If it continues i would see an orthopaedic surgeon: options cortisone injection vs surgery.

Trigger finger: Typically has a locking or clicking tendon, other things can click in a finger or thumb such as a joint, a tendon snapping over a bone spur , other areas of tendon irritation in the wrist, even a cyst or tumor on a tendon or just a joint click from. Normal motion but yes it sounds like the description you give is that of a trigger thumb. Many get permanent relief from corticosteroid injection.