Can't delete any files on my ftp, receiving no permission.

hi on my ftp when i try and delete any files i get the following message:

550 Cannot DELE. No permission.

i've given a lot of people access to it and someone changed the settings so i'm receiving this message now. How can i change that? Does it have anything to do with the fact that it says i'm entering passive mode? please help!!

Try right clicking the files and go to "Properties / CHMOD" and then give the files in question "read", "write" and "execute" right. If that goes well, you should be able to delete them again...