Supporter functionality

Hello,

I need help to fix a malfunction (I don't think it's a bug) concerning Supporter plugin.
It looks like there is a page missing when one connects to upgrade to supporter from a user dashboard.

Then from the super admin dashboard, it is impossible to manually upgrade a user to supporter services. for example, I select a blog ID and grant a 365 day upgrade to supporter, but the blog is not extended to supporter.

I am sure it is a peace of cake for a techy person, but it's a real maze for me, and my programmer dropped me on this one.

Your help would be highly appreciated. Please keep in mind that I am not an expert in programming or wpmu.

Thank you.

Olivier