I set up wireless router and now it won't turn back on

I had a friend set up the router so that my Comp sent out wireless signal.
It doesn't automatically turn on and I can't find how to turn it back on.
Please help i'm new to mac and these things are putting me off having one.

Hi RE,
Thanks for the answer, I have gotten it working, it was showing as being on (internet sharing) I then turned if off and on again (internet sharing) and that seemed to do it.

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