Like the content library template, other templates install some Task summary template components. We've documented them in these knowledge base articles:
Models
The Task summary template adds the Task summary model:

In addition, the template also adds the Task system model:

Pages
The template adds the Task systems page:

To add a task system, select ADD SYSTEM, which opens the Task system page in a modal window:

To view the details of an existing task system, select the item in the list:

You can then assign a task summary, on the Task system page, select TASK SUMMARIES, which opens the Task summaries page:
To add a task summary, select ASSIGN SUMMARY, which opens the Task summary page in a modal window:

You can also select an existing task summary to see its detail in the Task summary page:

If you need to set up another task system, on the Task summaries page, select SETUP TASK SUMMARIES.