How to unblock blocked files in Defense+ ?

I’m using COMODO Pro without the anti-virus, the anti-virus I use is other than comodo’s.
I have some files blocked in My Quarantined Files in Defense+ Common Tasks and I want to unblock then. How do I unblock these files?
There are these buttons: Add, Edit, Remove, Purge, Groups and below Apply and Cancel.


To unblock a file, you should choose the option Remove. This will remove the file from the list, and not from your system.

Ok, but, where is “blocked files” in Defense+?

Defense + → Computer Security Policy → Blocked Files.