I have a DNN484 website that I see with 2 names -
name.com
www.name.com

How do I set that name.com will redirect to www.name.com?

In DNN6 Admin/Site Settings/Site Alias, I can choose Canonical and the portal alias default. How do I set the same in an old DNN484?

OK. How do I do this? 
Can you write here the code I need to put in siteusrls.config?

I found a post here -
http://www.dnnsoftware.com/forums/forumid/198/threadid/447937/scope/posts/threadpage/1

I don't understand the solution they found there.
Here is what Limno suggested as a code for solving it -

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You can use URLRewrite  module installed with IIS 7 for your site:

Here is the code part in your webconfig you can write directly to the file

... 

<rewrite> 
<rules> 
<rule name="301 redirect from non-www to www"> 
<match url="(.*)" /> 
<conditions logicalGrouping="MatchAll" trackAllCaptures="false"> 
<add input="{HTTP_HOST}" pattern="^www\.mydomain\.com$" negate="true" /> 
</conditions> 
<action type="Redirect" url="http://www.mydomain.com/{R:1}" /> 
</rule> 
</rules> 
</rewrite> 

</system.webServer>

I tried to put the code in my web.config file but I get error.

Is it a code for web.config?
Can you help?

Yes.

If I have a website www.example.co.il, what do I need to do with the following code-
<add input="{HTTP_HOST}" pattern="^www\.mydomain\.com$" negate="true" />

Do I need to change to
<add input="{HTTP_HOST}" pattern="^www\.example\.co.il$" negate="true" />
?