Hello lets see if I can help.
1. Your cookies are not aligned properly here. I would suggest you set both applications like so
cookie path /
cookie prefix bb
cookie domain .yoursite.com
license number must be entered in the photopost config-inc.php file on the $vblicense line. You may want to rerun install and you can enter the cookie prefix and that will let you in admin.
2. As far as not uploading what do you mean by this as in what is the error? Or do you mean they dont have an upload link. If thats the case in admin under edit usergroups you would set permissions as you want.
If you still have issues after this you may send site link and sign in to support@photopost