Can you disble iPhone 5s fingerprint unlcock?

Is there a way to disable the fingerprint unlock and use a numeric unlock instead. The reason i'm asking is because i want to buy a waterproof case for my 5s but it will block the fingerprint unlock button so i want to know if there's a different way to unlock the 5s.

Any help is greatly appreciated

Ya if you don't want to use it you don't have to set it up on the phone.

Maybe go to settings and then tap on the lock settings