To Select a Check Box or Radio Button
You select a check box to specify an option or setting. You can select more than one check box in a group.
You also use a radio button (sometimes referred to as a choice button) to specify an option or setting, but only one radio button in a group can be selected at a time.
Click the check box or radio button you want to select.
Press Tab and the arrow keys until the check box or radio button has the keyboard focus, as shown by the highlight.
Press the Spacebar.