Integration with Basecamp is based on To-Do lists. Each time new issue is reported to Bugsee, we create new To-Do item in Basecamp.
Make sure you have at least one To-Do list in your Basecamp account to map Bugsee application to it. You can use any existing list or create a new one.
Bugsee uses OAuth to authentication with Basecamp. Once you start the wizard you will be automatically redierect to Basecamp to grant Bugsee permissions: