Well, first you'll need to be using a V2/Current profile.
Then, when you convert your code you get two sets of code:
Your media code:
http://static.wix.com/client/app.swf?pageId=oKg;ZMqCZvTRKfDAGoCltg--a&embedFormat=websites&embedID=24c031a9-7fb3-4ee7-bc05-50bf7b7efc18&partner_id=WMGs4POB1ko-a
Your CSS:
html, body { background: #000000; }
.column, #columns { overflow: visible !important; }
#columns { width: 700px; margin-left: auto; margin-right: auto; float: none; position: relative; top: 50px; }
#column_1, #column_2, #column_3 { position: absolute; margin: 0; }
.media_panel { height: 800px !important; width: 700px; overflow: hidden; }
.media_panel embed, .media_panel object { height: 700px; width: 700px; }
.panel { margin: 0; padding: 0; background: transparent; }
.panel h2 { display: none; }
Edit your profile and make sure that you only have one panel, and that that panel is a media panel.
Edit the media panel and paste in the media code.
Update the media panel and save your profile.
Next, paste the CSS in the big text box on your profile options page.
(note that if you do this while your profile is in V1 then change to V2, it won't carry over and you'll have to do it again)
If you're still having issues, get as far as you can and then leave your profile like it is (even if it looks a bit broken) then quote me and I'll help you clear it up.