[Zope] add/delete acl_user in dtml

[Steven Turoff]

Greetings,

I want to add and delete users using dtml. I found a how-to which indicates 
I can add a user using:

<dtml-let name="'Your_Name'" password="'Your_Password'"
roles="'Owner'"
domains="''"
 >
<dtml-var "py_addUser(_.None,acl_users,name,password,roles,domains)">
</dtml-let>

However, when I try this, I get:

Error Type: NameError
Error Value: py_addUser

Any help would be much obliged.

Steve