The register form appears to be displaying when I visit the link?!
I’m afraid that you are asking theme specific questions and this support forum is really geared to buddypress itself and it’s default theme. Salutation does a have support forums and asking there will get you a far better response also they will have guides that you should read and follow.
The top tabs are accessed from /wp-admin/themes.php?page=sidebars-top-tabs you need to also do something about adding their behaviour in the Appearance > widgets page
