Am using CuteFTP8. Under "edit" is "group select" with an asterisk for "select mask", which I assume is the group my FTP client uses.
At www\blog\wp-content, I right-click and go to Properties/CHMOD where group read is already selected. I select write & execute, apply and say OK.
I've also typed this up but don't know what to do with it:
$ cd /blog/
$ chgrp * wp-content
$ chmod g+w backup
Any help would be appreciated: I'm 2 weeks into WordPress and am in over my head, but firmly grasping the lifeboat.