How do I start the timer for a project?

You can start a timer for a project from:

From the Projects Module

Go to Time Tracking on the left sidebar.
Navigate to the Projects module at the top.
Click Start in the top left corner.
In the popup that appears, click Associate Project. The popup will expand.
Click the dropdown below the Project Name field and select the project for which you want to start the timer.
Click the dropdown below the Task Name field and select the task.
Click Start Timer.

The timer will start, and you can view the live timer at the bottom of the left sidebar. You can pause or stop the timer by clicking the Pause or Stop buttons respectively.

You can view the details of the time logged in the Timesheet tab of the project.

From the Timesheets Module

Go to Time Tracking on the left sidebar.
Navigate to the Timesheet module at the top.
Click Start in the top right corner.
In the popup that appears, click Associate Project. The popup will expand.
Click the dropdown below the Project Name field and select the project for which you want to start the timer.
Click the dropdown below the Task Name field and select the task.
Click Start Timer.

The timer will start and you can view the live timer at the bottom of the left sidebar. You can pause or stop the timer by clicking the Pause or Stop buttons respectively.

You can view the details of the logged time on the Timesheets List page.