I am using Membership plugin and I have a membership form

I am using Membership plugin and I have a membership form at http://inspire.vision/plans/ (Start Your Free Month).

Everything works fine, except that people have the wrong role defined when they subscribe. By default, it is 'subscriber'. I need it to be 'author', not 'subscriber'

Since your Membership plugin does not have an option to let me define the role of people who subscribe, I've modified your source code at Popup.php to include the following: <input type="hidden" name="role" value="author"> This unfortunately made no difference.

Right now, when people subscribe, they have to wait for several hours until I get the chance to manually modify their role from 'subscriber' to 'author'. Not a good situation at all.

Could you please help me out and tell me what to modify or add, so that I can sign up new members as 'authors' instead of 'subscribers'

Thank you,
Richard