Recently active topics in Wuala tagged with admin

i ask that because i create a group and i have some user but i don't want to be a admin...

I couldn't find much information about groups. If I am the admin and allowed members, after they upload, can I delete these links if they do not match the group's content or theme?
can they dirty up the group, if I am not online for a few days? can I permit a few members to be like operators and keep the group with the right content? can I ban a member? can I ban him for only a day or a few hours?
will I be notified of changes to the group I created?
thank you for any of these answers
kobi