create a site after signing up for BP

Hi,

here is the stage ;
running a BuddyPress community on a "multisite" with the available option to create a site.

initially a user chooses to register for the community as a BuddyPress member but chooses "NOT" to create a site.

After the fact, how does the user now create a site ?

What is the workflow ; what specific link recreates this process ?
eg. If they go to the "ProSites" page while logged in, just the site creation option will be available ?

Any kind assistance in this would be greatly appreciated.

Kind regards,

RC.