Hello, Carole -
If you have the owner's manual for your Janome Decor Excel 5018 sewing machine, then you can find the diagram naming the parts of the sewing machine (page 2, English text) and showing part #22, the drop feed lever. This is the lever which controls the feed dog.
If that lever does not move either way, then there may be something jamming the feed dog (like lint) or it may need cleaning and oiling.
If you don't have the manual for your machine, see the image to which I refer here:
https://www.manualslib.com/manual/994905/Janome-Decor-Excel-5018.html?page=8#manual
See this page from the manual to find out how to clean the feed dog:
https://www.manualslib.com/manual/994905/Janome-Decor-Excel-5018.html?page=78#manual
Another possibility for the feed dog not moving is if you have your machine set to the "free-motion" or "darning" operation, which disables the feed dog.
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