BuddyPress.org

i’ve made a mistake in my previous post.
After having activate BP, not even the admin so that the user can create a new site.
In fact, this link works:
http://subdomain.mydomain.com/wp-admin/network/site-new.php
But this one does not work:
http://subdomain.mydomain.com/blogs/create
And depending on where i click, the link to create a site is different
lol i loose myself in this problem, hope i’m clear enough for someone how would help me!!