Use scanning mode

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On the Settings menu, click Typing Mode.
In the Typing Mode dialog box, click Joystick or key to select.
In Scan interval, select a number to set the speed for how quickly On-Screen Keyboard scans.
Click Advanced, and then click the appropriate option to do one of the following:

Select Serial, parallel, or game port to designate that a pointing device will be used to select the highlighted keyboard characters you want to type.
Select Keyboard key to designate a key to be used to select the highlighted keyboard characters you want to type, and select the key from the list.

Notes

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On-Screen Keyboard scans by highlighting each row of keys from the top to the bottom of the keyboard. When the row that contains the key you want to type is highlighted, use the choice you made in step 5 to select the row.

If you are using Regular Layout, On-Screen Keyboard then scans the individual characters in the row. When the key you want to type is highlighted, use the choice you made in step 5 to select the character.

If you are using Block Layout, On-Screen Keyboard then scans the row. When the group of characters that contains the key you want to type is highlighted, use the choice you made in step 5 to select a group of characters. On-Screen Keyboard then scans the individual characters within the group, and when the key you want to type is highlighted, use the choice you made in step 5 to select the character.