You can use the turn code blocks to turn the robot left or right by a specified number of degrees:

The first version of the turn block above allows you to tell the robot to turn Left or Right by clicking the drop-down menu and choosing Left or Right:

You can also specify how much the robot should turn by clicking the angle value to display a unit circle dial that shows the angle. Move the mouse pointer around the dial until you have the angle you want, then click to set it. Here are two examples, one for 90 degrees and one for 45 degrees:

The second version of the turn block above allows you to enter a specific value for the angle to turn left or right by changing the value in the blue block.

The examples below show how it works. Click the Video at top right to learn more and see a demonstration.