Hi Brenda,
To edit your web pages you could use a WYSIWYG (What You See Is What You Get) editor such as Microsoft FrontPage or Macromedia Dreamweaver (unfortunately, they come at a price...) or you could use Notepad or another text editor if you fancy delving straight into the HTML.
The HTML tag for a link would look like this:
Code:
<a href="http://www.domain.com" target="_blank">Click here!</a>
The href="x" part holds the URL that the hyperlink will redirect the user to if/when they click it, and the target="_blank" part makes the link open in a new window. You can also use target="_top" so the link takes over the whole browser window (useful for getting rid of frames), or if you do use frames on your website you can use target="_self" to make the link load in the frame that it displays in.
A chat room could be a little harder, I'd search around Google for a free chat room provider, perhaps a site like bravenet.com offers a free service.
Hope this helps,
conf.