Go to app.topline.com
1. Click "Settings"
Access to the Settings menu, by clicking on the option on the left side menu.
2. Click "My Profile"
Navigate to the My Profile section on the left side menu.
3. Look Calendar Configuration
Navigate to the Calendar Configuration option.
4. Click "Edit"
On the Primary Calendar option, click on edit.
5. Select Calendar
On the pop up window select the calendar you want to set as primary.
6. Check Information
Make sure the email you selected, is the one you want to set as primary calendar.
7. Click "Save"
If everything is correct, click on save.
8. Primary Calendar
Now the email selected is the primary calendar. You can edit it anytime by repeating the process.