My bits not working

so I have my machine ready to carve but when in easel before it start carve it let you raise bit but it is go down in the peace on the machine what is go on

It sounds like your Z axis is wired backwards. Double check your Z axis wiring.

I checked the wires first and look at the wire diagram and they look good

I did set up but I am new to all this stuff so I might not get it right so is there something you think I should look at in set up

Its important for you to know about the system before you try to use it. There is a lot of information here on the forums.
You can set the direction of the motors via command codes. These codes are in the configuring page below.
You can look up the settings Here: https://github.com/grbl/grbl/wiki/Configuring-Grbl-v0.9
And I would recommend you read this as well: https://github.com/gnea/grbl/wiki

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