Hi, then as above. I havnt used yahoo, so i am not sure if you can just do it from their area or not. But you should be able to just point the domain at vodahost.
This is assuming its not an odd domain like
www.myname.yahoo.com which would be classed as a sub domain & yahoo may have rules on this.
But if it is important to keep this domain & it cant be redirected via the admin areas of yahoo. You can alway put a redirect bit of code in your yahoo's home page header.
Something like...........
<meta http-equiv="REFRESH" content="0;url=http://www.the-domain-you-want-to-redirect-to.com">