Purchase domain doesn't work in Domain Mapping

I've configured domain reseller in domain mapping options but there's no purchase domain button in my backend.

https://www.dropbox.com/s/zghp5pgztyo8fmh/Screenshot%202015-06-08%2011.45.26.png?dl=0

I'm also aiming for an easier configuration on where I can integrate memberships plugin in prosite plugin.

With your previous membership plugin I can edit the number of sites that a user can create in my multisite but it's not integrated with prosite plugin so I have to subscribe again apart from the subscription I have with membership plugin. so how can I make both work or shall I create a new thread for this part?

Thank you! :slight_smile: Looking forward for your response. Cheers!