In short: install webmin on the server you want to administrate remotely, but allow only connections from "localhost". Give an account of your choice - preferably not any root-like one - ssh access. Build a tunnel to your server's local port 10000
ssh -L <chooseaport>:localhost:10000 <username>@<IPofremotemachine>
Now you can access the remote webmin interface simply by opening a browser of your choice on your machine and typing
into the address bar. Nice easy, and secure!
Additionally: if your SSH server is listening on a different port than the standard port 22, you can connect to it using the -p option, i.e.
ssh -p <portnumber> -L <chooseaport>:localhost:10000 <username>@<IPofremotemachine>