Changing Default PDF Reader

Hi there I couldn't find an answer to this question anywhere.I was wanting to change my default PDF reader to skim instead of preview but just can't find a setting that will do this. Has anyone any idea. I just know it's going to be something simple.Thanks.Ry

You get info on any PDF file i

Then select the default program you want from the pull down menu

Then select the Change all button

Thanks very much.All sorted now.I knew It would be something simple.Thanks for your help.Ry