You can use the <TAB> key to switch focus between different panels ("Available Services", "Runlevel 1 Start", "Runlevel 1 Stop", etc.) and the cursor keys to move the selection up and down.
To move an entry to a different runlevel, "Cut" it to the clipboard (using <Ctrl-X>, or the key you specified in Settings/Keys/Standard Keys) and "Paste" it in the target runlevel (default shortcut: <Ctrl-V>).
To manually change an entries sorting number or name, press <ENTER> to open the properties dialog. Use the <TAB> key to switch between different fields. Close the dialog by pressing <ENTER> to accept the modifications, or press <Esc> to cancel any changes.