how to change the API configuration for different CRMs

I am currently trying out different CRMs with the fusion plugin. In the initial settings, I connected to a particular CRM.

Now I would like to try out another CRM. But in fusion plugin setup there is no way to change or synchonize with a different CRM, as the selection is now greyed out.

I have tried disabling and deleting the fusion plugin and then reinstalling it again with same results. I am assuming that the data is not erased when the plugin is deleted.

Is there a way around this – to change the CRM is the fusion plugin setup? I can even go phpmyadmin to delete rows etc if needed. Was not able to search for a relevant documentaion on this. Did i miss something?

I am only remotely technical, so please talk to me like I’m five.