The Contalist web app is the hero behind the PowerUp. With it you get more funtionalities, for example manage your contacts, creating message templates... You can find it at https://app.contalist.com .
When you connected your Trello account with Contalist (when being asked when adding our PowerUp to your board), a Contalist account has been created for you automatically, with the same email address of your Trello account.
It's possible to sign into Contalist with Google/Outlook, or with your email address and password.
Signing in via Google/Outlook is easy. Just click the Sign with with Google or Outlook button when being asked, the follow Google/Outlook's sign-in flow. It's all done.
🔴 Of course, you need to use the same email address as your Trello account when signing in.
It's also possible to sign in with email address with the sign-in form. As you have seen, the email address is same as your Trello account, but what's the password?
You will need to reset the password first, as the password for your Contalist account hasn't been set yet. To reset your password, click the Forgot password link under the sign in form, then fill your email address and click the reset button. A reset link will be sent to you.
Use the forgot password link to reset it please.