i noticed you can sell items in the usershop for csc but i dont see the input button for it! do i have to have a gold account to do it?

It's only available if you are selling a Custom Wearable. The staff coded it so that if you put one of them in your shop, it will show you an input box for a CSC amount for that item.

Only CWs can be priced for CSC in user shops, so for all other items you can only use sP prices.