I cant get things to come off my tradelist. I click the number in blue, and type 0 and hit enter and they disappear, but then when I refresh its added again.

Sounds like a bug. I'd submit a support ticket for that. Go to the Help page and look for Contact, Support, & Feedback on the left. Be sure to mention what device you were using.

Also, have you tried using "Remove selected" from the "Card Actions" menu? That might work in your case.

I just tested it on my account, and I was able to type a zero then refresh, and the card had been permanently deleted from my Tradelist. So it's not a site-wide bug.