I'll do this the bad way - I'm writing up a CSS guide for this site over the weekend so check back to this category later if you want some guidance on doing it the proper way.
In between the <head> tags of your HTML page put this:
Code:
<style>
a {
text-decoration: none;
color: yellow;
}
</style>
That will make
all links on your page yellow and not-underlined. If you want just certain links coloured yellow, place the following between your <head> tags:
Code:
<style>
.link {
text-decoration: none;
color: yellow;
}
</style>
Then make your HTML links look like this:
Code:
<a href="home.html" class="link">a link</a>
Just a quick note - Removing the underline on links if often "frowned upon". It makes it quite hard to tell what is a link and what isn't.