To enable this create a page say SITE A note its id.

Your registration link should look like

<a href=":url-reg-X:">Register</a>

change X to id of A

Now in Site A put this code
[text] <div class="header">Change Profile Photo</div><img src="http://wfs-01.wapka.mobi/4945/4945028_748e79e294.png" alt="" /><br/>:eprofile-xx: Photo(jpg,gif,png,jpeg)<br/>::photo:: @@change photo :/eprofile: [/text]