First of all, you need to copy your personal URL link from Teamgate “My profile” settings section “Integrations”.
Then, please follow these steps:
1. Open the Settings app.
2. Tap Mail, Contacts, Calendars.
3. Tap Add Account.
4. Tap Other.
5. Select the account you wish to configure.
6. Enter your service information. If you don’t know it off-hand, you’ll need to get it from a system administrator or whoever runs your CalDAV, account.
7. Tap the Next button in the upper right-hand corner, and your device will verify the account.
8. If everything looks right, tap on Done. Your account will now start syncing with your iPhone, iPad, or iPod touch.