Can't delete a label

I have filtered for them yes. It appears many have had this problem even after filtering and making sure they aren’t assigned to anything. Furthermore I didn’t create the labels with just the space only the ones with the + in the middle. Here are some more examples of unresolved posts that address the same issue.

Thanks so much for offering to help. Where is the database located? Are there any tutorials I can follow on how to do this myself? Also, is there anyway of me checking to make sure they aren’t associated with any files other than filtering or is that the best way? I’ll probably end up pm’ing you my database and I greatly appreciate your help!