@Jamesmor Oh thanks so much! that seems to do the trick. Its deleting the rest now!
Really wondering why adding permissions is so complicated rather than just having a list with users and their permissions and being able to edit that
EDIT: It's deleted, thank you again!
EDIT2: it worked for one folder but once I go to another one it doesn't let me add users and the security screen looks kinda different One folder has the Add/Remove/Edit options, which allowed me to add myself and delete the folder. But folder two doesn't have these options and instead has Change permissions, which brings me to the add/remove/edit version with everything greyed out