Do you mean put the site in to 'Maintenance Mode'?
If so, go to Settings in your Admin Panel followed by the Security Section.
In there you will find the option to put in Maintenance Mode & where you can enter a reason which will be displayed to your visitors. You can also change the level of user that can still access the site. For example if you have a number of Administrators you can let them all access it or you can choose to just have the site owner access it.
Hope this helps.
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