How do i add items to my pointshop?

Hello, i have Pointshop 2 on my Deathrun server and a perk with having Pointshop 2 is that you can make playermodels, trails and such ingame and it makes everything so much easier.

But i’m really struggling with getting CSGO knives into my pointshop, i have the workshop addon and the server addon but i don’t see how im suppose to add it to my pointshop, it doesnt give me the option.
Can anyone help me?

Thanks alot!