Hello Crabby , If you click the Tent Icon there should be a button for install camp, if you already have the campsite from behr you don't have to worry about unregistering it you'll have the option to change it's appearance and there will be slots for you to equip the anvil tools shop etc from the pack.

to remove old parts, click the tent icon, then right click the item/part icon you want to replace. it will go to your inventory then you can finally equip the new parts.