Don't go to a computer forum and advertise another computer help site, go somewhere else and advertise. If you want to offer computer help then help the members on this site.
Another thing, if you'd have actually become part of the community first and posted a while before you plugged your site, it probably wouldn't have been deleted. But you join and your very first post is an advertisement for your website, that is a no no. You'd be marked as a spammer on any forum.