I cannot back up my phone or my iPad because I don't have enough storage on the cloud (although I did buy extra storage). I was synching my photos on my devices and my Mad but I took this function off and I still have no storage.

I reckon that my iCloud is full with my photos but I can not find the way to delete photos or videos from I cloud

Photo stream photos don't use any of your iCloud storage so deleting them won't make any difference.  Only camera roll photos use your photos, and only if you are backing up to iCloud, as they are included in the backup.
To see what is using your storage, go to Settings>iCloud>Storage & Bakup>Manage Storage.  This article provides some suggestions for reducing your storage: http://support.apple.com/kb/ht4847.

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