XF 1.5 need help with 301 redirect and .htaccess file


I'm still trying to learn Xenforo and heck, even doing things via FTP are new to me.

I need to learn how to make a 301 re-write rule in my .htaccess file. I have no idea how to do so.

My forum is hosted on Dreamhost, should I contact them instead?

Anyone out there who can help please?