On the Source Definition of your import task, in filters, specify the name of the Google Calendar to get events from instead of Enter your Calendar name....
On the Mapping Definition of your import task, for the AccountId field, specify the ID of your Timely account instead of 12345.
For the ProjectId field, specify the name of your Timely project to associate with the event instead of Enter your Project name....
If you need to create Timely events only for specific new Google Calendar events, you can add more filter conditions for the source subscribers.
You can also add more similar filters with different Calendar names and use OR operator to import Google Calendar events from multiple Calendars. You can also remove filters if you want to import Google Calendar events from all your Google Calendars.