Why am I unable to add items to my shop? When I click on an item to add it to my shop nothing comes up under your shops. Also I do not have the option of adding multiple at a time. Please help

It sounds like you haven't been on Subeta for quite a while. Shops have been completely overhauled and your old shop can no longer have items added to it. There is a guide available here:

https://subeta.net/forums.php/read/854270/New-Shop-Guides

thank you:)

Good luck setting up your new shop! And welcome back to Subeta. :)