Later.

Not sure if it's what you want but if you set it so that the 'Filtered' and 'C.Green' checkboxes are ticked and make sure 'C.Red' is left unticked it'll display only the contributor giveaways that you're eligible to enter.

It doesn't give you this functionality, but it allows you to filter out contributor giveaways you don't qualify for, as well as non-contributor giveaways.

You should see this.

Just check the checkbox for C. Green. You will only see Contributor giveaways you can enter.