Simply login as the “Admin” and choose the option to “Shut Down the Forum”. You can type a message that will appear to all others when they attempt to use the forum while you work on it. You, as the “Admin” will not see the “Shut Down” version of the forum.
You can work in the “Admin” section or the forum itself while in this mode.
There is no “Restart” the forum option. It will return to “Running” status after you are through and log out