You can't, i've reported the thread for an admin to delete... also sub for sub ruins channels as there not active subs they haven't subscribed to you because they like your content and will keep watching when you upload, they subbed to you because you subbed to them so its just pointless to do sub for sub in my opinion.
Ok i just changed everything so theres no need to do anything now[DOUBLEPOST=1513277107][/DOUBLEPOST]
Just delete your comments and ill delete mine so like this never happened
For future reference you can press the "Report" Button on your Threads to request deletion by a Moderator or Administrator.
As it's already been pointed out that sub4sub isn't a good thing I don't feel like I need to jump on that as well, just refrain from doing it in the future.