As @ProjektNemesis117 pointed out to me, up until now it wasn’t possible for contributors to create profiles for other contributors. I’ve made a small change to the site’s content management system so that this is now possible. If we’ve already given you access to add content directly to the site, just click on the ‘Contributors’ link at the top of the site, and then ‘New Contributor Profile’.
Contributor Profiles will require approval by an admin before they are published (as with everything else on the site).