Hello Sadie,
We were experiencing a difficulty earlier today with item condition showing appropriately on the lister page in some categories, which would have prevented items from posting if condition was a requirement for the category. However, our engineers have since resolved the issue that was occurring and you should have the option for item condition in appropriate categories on the lister page of your account.
Should you still be encountering difficulty with particular categories, please let us know which categories you run into issues with in a support case and we'll be happy to look into it further. You can file a support case at any time from under the Help tab of the site.
- Craig