Zoho and Ringio

Zoho and Ringio

I configured my Zoho CRM to use Ringio (Apps & Add-ons > Other Apps > PhoneBridge) to try out the integration with Ringio. I have finished testing and now I now want to configure to test a different provider (Twilio) however there is not an option to switch from Ringio to Twilio in Zoho. How do I remove the Ringio integration and configure a different PhoneBridge add-on???