I have purchased: Scroll of Return to O'Delvays Magic
1st. it is in Effects Tab, instead of Items Tab.
2nd. when you like to use it to jump back to City, it is actualy brings Action window with drop down menu:
Are you sure you want to use Enchantments? When applied to an item that is already enchanted, the new enchantment will replace the old.
drop down meanu to choose armour/weapon
You didn't buy scroll of return, you bought the spell of that scroll, which is like 200 scrolls in a batch applied on your armor. Just apply it on a free item (you can only apply 1 spell on each item) and the go to that item, you should see a green square on left corner of the item, click on it to use 1 scroll out of the 200 you bought. Or you could click b in your keyboard (Shortcut for combat backpack), then click on the item you applied the spell on to use the scroll.
It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.