i get the following message when i click home on my live site

Forbidden

You don't have permission to access /odinsminiatureshop/ on this server.

the web browser displays
http://www.odinsminiatures.com/odinsminiatureshop/

and it should have index.php at the end

Can someone help me out and tell me what file i need to edit and where to add index.php please.
As customers cannot return to my homepage without pressing back they just get forbidden message.

thanks

michelle