How to set a timer in Nikon D3000?

You know like when you want to take a group picture and you want to be in it. You set the camera to wait 5 seconds and then takes the picture by itself, sorry about the example but that's what I need help with. I don't have the manual with me right now and I'm looking online and can't find anything.

I will really appreciate your help.

Added (1). Help.

Http://lmgtfy.com/?q=Nikon+D3000+manual

Was that so hard?

Step 1. Turn camera off

Step 2. Read this.