[Xitami] Changing Port 80

[d calif]

I have been getting attacked on port 80 with "get NT" type request.  The 
attacks increased from once a day to now multiple times.

I want to change my http: 80 port to 9748, which i did and by using my 
current dynamic ip
ip:9748 works.

My question is how to make the change so the
mywebsite.yi.org  goes to  mywebsite.yi.org:9748

In a couple of past list, CNAME was suppose to be added.

yi.org  doesn't provide clear step by step info on how to do this
http://www.yi.org/help/admin/rr.shtml

And I'm either too tired or too stupid to figure it out.  Most likely both.
If someone has experience with yi.org   I would appreciate some help.

I need to use mywebsite.yi.org to serve my perl/cgi dynamic html pages

Thanks in advance for any help