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To check the everything was configured correctly during user creation, re-login with the new user credentials and ensure, this user have access only to modules we have selected.
Done!
Anytime you can change list of modules that user has access to. It can be done by user himself, if he has access to Webmin Users module, or by another user with appropriate permissions,
In our example user does not have access to Webmin Users module, so to add him additional access do following:
Re-login with root credentials
Expand spoiler Webmin and click Webmin Users module link
Click the user name whom we would like to add access to
Expand spoiler Available Webmin modules and mark the module we need (e.g. Webmin users)
Click Save button at the bottom of the list
Re-login with webadmin user crdentials and check that new module is shown in the list