Step by step guide huh. Well i can give it my best, ok
In myspace.com front page login to your account.
When you have logged in to myspace and looking at your myspace go to "Edit Profile" when in that it should come up with Headline, About Me. etc...
Scroll down to "I'd like to meet:" then enter the html code. then scroll back up and save all changes. you wont be able to see this on the editing screen. so type www.myspace.com/ your myspace website. then have alook at it. as it should be there.
To get html codes you can search on myspace.com.... google.com... live.com etc.
Hope this helps you.
Matty34