You have created your scenario, configured the load, and distributed that load over the locations. It is time to decide what to do with this config. You can start the test immediately or store this configuration as a Test Plan to use it anytime.
To start a new test, you should provide a test name first. The test name is mandatory since you will distinguish test results by test names.
After providing the test name, click the Start New Test button. If everything goes well, you will be redirected to the Live Test Reporting Page.
If you want to save this configuration to reuse it anytime, give a unique test plan name and click the Save button.
If the test plan is saved successfully, you'll realize that the test plan name appeared right of the Test Suite title. This means that Test Suite changed its mode from New to Test Plan Edit. From now on, every change you make will update this test plan.
If you want to create a new test from the saved plan, just give a test name and click the Start New Test button. If everything goes well, you will be redirected to the Live Test Reporting Page.