If you're asking how to enter links in comments, the answer is simply like this:
This is [a link](http://url.com)
Text in square brackets, then URL in brackets/parenthesis.
Your design is flawed because it lacks a [rotating cube](http://dl.dropboxusercontent.com/u/25059665/CustomerForm.html), for more details see [this question](https://ux.stackexchange.com/questions/11229/is-this-rotating-cube-interface-user-friendly).
Your design is flawed because it lacks a rotating
for more details see this
Works in answers, questions, comments, and chat)
Super Secret Bonus
You can also add title text to the links by doing the following (also works in comments and chat):
[hyperlink](http://example.com "Look at this wonderful title text that pops up when you hover over the link")