I'm not quite sure what you're asking here. Do you want to set up a simple hyperlink? That would be:

<a href="yoursite.com/help">Click Here to go to help</a>
Or are you asking how to re-direct the url so when you type

yoursite.com it takes you to yoursite.com/help ? In which case you would use Meta tags in your HEAD section of html.

<meta HTTP-EQUIV="REFRESH" content="0; url=yoursite.com/help.html">
I hope this helped in some way.

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