I have installed the e-newsletter plugin - I have a single

I have installed the e-newsletter plugin - I have a single installation of wordpress not multipress - The plugin installed fine and I configured the emails settings and tested them and they worked fine (I got a message to say I could save the settings but there is no save button) but my main issue is when I then try to actually do the 'Install' part of the application I get the message'You have insufficient permissions to access this page' - I am logged in as Admin.

Any help?