XF 1.5 Extra buttons - how?

[Spleen]

How do I add another button here? I want to create a site Shop but I also want to add an Upgrade button to make it easier for people to Upgrade their user status, again paid. On the right next to Members for Shop and then Upgrade next to member name, in this case The CO. Thanks.

 

[Spleen]

A slightly more sensible question would be: 'Is there a store add on?' I'd still like to short cut the Account Upgrade though.