When you hear the menu item of interest, press the 6 key to open the submenu. When you want to leave a submenu or settings, press asterisk. When in a submenu, the 2 and 8 keys work as they do in the main menu, moving up and down the menu choices. The 5 key gives the current setting and its value. If you want to change the value, use the 4 and 6 keys to cycle through values of the settings.
Most submenus have an item called defaults.
When defaults is selected with the 6 key, all settings of that submenu are returned to their default settings. Here is a settings example. If you want this quick help page or any page you are looking at to be the startup page, press asterisk to enter the settings menu. Press 5 to confirm the setting. Press asterisk to exit miscellaneous settings.