Within Teamwork Projects you can subscribe to a webinar directly from your installation of Projects.
To sign up, click on 'Help' to the top right of your Teamwork site, hover over 'Support Center' and then choose 'Webinars':
The support center will load on the webinar tab where you can browse the available webinars:
When you find the webinar you need you can select 'Join Webinar'. You will then be notified that you are registered and to check your email which will include further webinar information:
For more information see: Webinars for Teamwork Projects