Magic Chef gas oven won't turn on

We have never had a problem with our stove until last week when I turned it on, it didn’t turn on and the flame is out. How do we relight the pilot light and how do we know if it’s that or if it has died out on us? The burners still work fine. TIA.

I saw there was a reply to my original question with a pic posted of the part we need but now it’s gone. Can someone please reply again? TY!