Within Teamwork Desk, you can enable Teamwork CRM for your site.
Click your profile icon in the top right of your site and select Settings from the dropdown menu.
Note: Only site administrators can access the site settings.
In the Settings area, go to the Apps tab where you will see an option for Teamwork CRM.
Click Enable to enable Teamwork CRM for your site. Users in your owner company will then see Teamwork CRM appear as an option in the product switcher.
For more information, see: Working with Teamwork Desk