Let me tell you by experience that what you want to do, is just undoing all the security done to your preconfigured server. It is difficult to do this because of the precautions thought by the expert webmasters.

You should read more about all. Webmin is a good tool to manage the global vision about your server. You are able to see the whole context and then make specifical changes.

Webmin should be installed and running at port 10000. Try running http://localhost:10000 to see if it is working.

And then, read as much as you can about it, in it's help file.

To download it for *NIX systems, see the https://sourceforge.net/projects/webadmin/ page. This masterpiece is done completely in Perl.