How to test the opt-in to new Domain option with an AdobeSign Partner license

In the May-June timeframe, Adobe is supposed to have added a new option to opt-in to the new domain through their application UI (via the account admins menu). I am trying to test this 'opt-in' option to make sure it does not break our application and cannot to find this option in the account admins menu. Is there a way for me to test this opt-in option?

More info regarding the change can be found here: (https://helpx.adobe.com/sign/using/echosign-domain-change.html)