inoperable wp admin due to Signup Password plugin

Greetings spectacular support folks!

I just installed the Set Password plugin using the wp dashboard and now any link I click in my wp admin just loads a white page with the error message "The Signup Password plugin is only compatible with WordPress Multisite.".

So I am not able to uninstall the plugin, since trying to get to the uninstall interface also just gets me to that site...please help asap!

Thank you

Raam