how do you get a bow fishing licence

Answer:

There isn't a special bow-fishing license.  All that is needed is a fishing license.

More information:

Archery and Spear Fishing: Fishing with a bow and arrow, crossbow, spear or mechanical device, excluding firearms.

This type of fishing is permitted only in the taking of bullfrogs and unprotected nongame fish and only in those waters during the season set for the taking of game fish.