Hi,
I know the problem you're having - dot.tk (the people that allow you to register .tk for free) do not allow people to alter the document that frames their advertising bit and your site.
To be honest, if I were you, I'd buy a 'proper' domain name - they don't cost the world - eg you can buy a .co.uk domain for about £2.
If you're serious about trying to get good results in the search engines, dump .tk and go for a domain name that you can control better. I actually dumped them because of the time it takes for websites hosted via the dot.tk to load. They might have updated everything by now, but I can't ever remember a .tk site loading particularly quickly.
Good Luck,
Ronald
www.ronkymac.com
edit: it's possible to remove the adverts from the .tk service - I'm guessing that's what you're 'aargh'ing about. Have a look through the settings there - it's definately possible to remove them.