Can't use tag-function


I just tried out ripping some DVDs with ratDVD, but I’m unable to tag them. The first time I inserted a DVD, I could press the “Tags”-button but then the program crashed and I had to restart. Now after reloading the DVD into the program, I couldn’t choose the tag-button anymore, it stays greyed out. Same with other DVDs.

Is this a bug or do I need to reactivate a certain option?