When you are using the System diagnostics program, you often need to select an option from a menu. There are two ways to do this:
Cl You can use the arrow keys (T L t +) to move the highlighted cursor block to the option you want and then press Enter to select it.
Li You can type the number of the desired option and press Enter to select it.
For example, you may see this menu:
1 - Run test one time
2 - Run test multiple times
0 - Exit
Suppose the first option is highlighted. If you want to select that option, just press Enter (because it is already highlighted). If
you want to select option 2, you can either press 
or 2; this causes the cursor block to move to that option. Then press Enter to select it.
Therefore, when you select an option, you can either use T, J, c, or + to highlight the option or you can type the number of the option. Then press Enter. (YOU must press Enter to start the operation.)
Note
You can press ESC any time you want to leave the menu currently displayed and return to the previous one.