iPhone and iPad users who have had issues accessing the tabs at the top of the inventory formspec, there is an easy workaround you can perform in order to be able to access your crafting guide, skins, armor, etc.
There is no official Minetest client for iOS, and for some reason the way Minetest appears on some iOS mobile devices is not correct. The HOMETOWN inventory is built off of the default sninv inventory. The inventory tabs are not visible on some iOS devices, but some iOS users have found re-setting the gui_scaling solves the issue. Explaining the process sounds overwhelming for us non-techy folk, so I'm hoping some visuals will show how easy it really is. :)
Select "Settings"
Select "Advanced Settings"
Type "gui_scaling" in the search field and select "Search"
Select "Restore Default"
You should automatically see your game screen resized, and when you are in-game you will (hopefully) see the appearance of tabs at the top of your inventory formspec. All done! :D