now where's the + rep button? lol

Hi... So i want to sell a key. A key seems to be worth 18 refined metal.

So I tried to ask for 18 refined metal... but the interface won't let me add more than 8 refined metal????

I don't get it. How do I ask for 18 refined metal if there is only 8 slots?

http://www.tf2outpost.com/new