I seem to have the ability to create fire arrows, but I dont seem to be able to equip them with my bow. What do you need to do in order to be able to equip fire arrows?
You may have the beginner bow, in which case you will need to upgrade to something better. Some weapons are limited to certain ammo types. In order to use the more powerful types of ammo you need the upgraded weapon. You will be able to use fire arrows if you have the carja hunter bow, so make sure you have this first and you should be able to equip the fire arrows then.