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Yahoo usually starts you out with an index.htm or index.html file in your root directory.Thats what it looks like your site is going on at the moment.
Your pyshical path at the moment is probably something like this
http://yoursite.net/xoopsversion/htmlXoops version meaning whatever file you uploaded to your hosting account that contain the html folder.You need the files contained within the html folder placed within the same folder that contains the current index.htm or index.html file that is currentlty running your site.Once those file are in the right spot you should be able to start doing something by just typing in your sites url otherwise it will keep using those files.
been awhile since i used yahoo so cant say for sure where your XOOPS files got lodged but they dont appear to be in your root folder.