confused and lost!!

Hey guys, I recently installed the XD Forum which i installed successfully. I was given the URL https://www.fishingextra.co.uk/?a=xdforum I wanted a link to this at the top of my page. I tired to create a page and now i have the url https://www.fishingextra.co.uk/fishing-forums/ which contains nothing. can any one explain in idiot detail how i get this to have https://www.fishingextra.co.uk/?a=xdforum when it comes up? i tried to edit the html part of the create page section so i could use a php include statement.. i’m not entirely sure what im doing.. can someone give me a clue please..