To add your Medium account, please follow the steps below:
To create a Medium App, the following elements on your account should be ready.
When Medium accepts your request, you will see the developers menu under the settings of your account.
Click the Manage Applications button to create a new App. Fill out the form. You can copy your Callback URL from the Medium App menu:
And click the Save button. Now your App is ready. Copy your Client ID and Client Secret and add your App to the plugin.
Choose your personal App to add your Medium accounts.