So, I have a few items in my inventory. I click edit, and it doesn't show the bar where you insert the price and sell it on the market. Please help, I am tired of having the things I already had for 1 year.

Make sure the item is not in the set. Also some items such as shiai tokens are untradeable (you can only exchange st for special st items).

Ah, I feel very dumb, thanks for clearing it up.