The Application Name will be displayed to users when they attempt to register via Yahoo.
The Application Type is a Web Application
The Description is optional.
The Homepage URL should be set to the Board URL value set in XenForo.
The Redirect URI should be set to <XF board URL>/connected_account.php. For example, https://xenforo.com/community/connected_account.php. The beginning of this URL must match your Board URL setting in XenForo exactly.
In API permissions tick OpenID Connect Permissions, Email and Profile
Once you click Create App note down the Client ID and Client Secret.