You don't. Texas doesn't require registration.
Kansas does not require handgun registration, so the answer is, you can't register it.
No, Missouri does not require handgun registration.
No, Texas does not require handgun registration.
It depends on where you are. There is no national handgun registration and only a handful of states require it.
No. The state of Kentucky does not require handgun registration.
Go to the nearest police station. Actually, the answer is, you don't. The state of Florida does not require handgun registration.
You don't. Kansas doesn't require registration.
You don't. The state of Arizona doesn't require registration.
Texas does not require gun registration.
It depends on where you are. In the U.S. only a very few states require registration.
Florida does not require handgun registration, so the answer is, you don't. If you are referring to a permit to carry, check with a local gun range. They should be able to tell you how to go about it.