-my files is public ? no, you choose with the button "share" if you want to change private by public
and after on "unshare" if you want to private your file
-how can i manage my cloud? On the left you have a aside main - you can create folder manage your trash and show file only by folder.
-i delete my file but i can't upload more file? if you can't upload more file it's because you reach your limit of 2GO because you'r not a premium members
and when you delete file go to the trash in the aside main and open the trash , now you can choose to delete forever your file.
don't forget you can copy your public adress of your cloud if you want to share