Adding users to the Joomla contact page is not a hard task at all.
First you will want to login to your Administration (back end). You will go to:
Components -> Contacts -> Categories and click on categories.
By default, Joomla shows a category called contacts. This can be updated, used, or you can create your own category.
To create a new category, click on the new button in the upper right corner, and an editing page will open. You can name the category in the title field, the alias field is the computer programming name which should not include any spaces. The alias will not show to the user, only the title. Click YES on the published field, you can add an image, align it right or left, and even add a description which will only show up for back end users. Click finish and you have created a category for your new user(s).
Go back to your main category page, and you will be able to choose from category or contact. Since you have already added your category, you will now choose contact. There is a default contact there already, with the name of name. It is easy to just update this item, by clicking on it, and updating the information that is already set. For purposes of this tutorial however, we are going to create a new contact from scratch. Click on NEW. This will open an editing window where you can add the contact name, alias for the computer, and the rest of the left side of the window is your custom information. On the right side of the window we see a lot of parameters. Under contact parameters, you will fill out the address, and other contact information, and at the end you will see an option for VCard. This is a handy sort of digital business card, that will allow visitors to download a preformatted vcard of the contact. You can find out more about vcards at http://en.wikipedia.org/wiki/VCard . Under advanced parameters, you can choose from different icons, if you want custom icons, you can add them into the media folder under icons, then they will be available here to insert into your contact. Under Email Parameters, you can edit the contact form that will be on the contact page for the visitor to use to contact you. You can choose from the subject that comes to you when they send the form, you can choose from banned words, subjects, etc. that are sent to you as well.
With a little time and effort, the contact capabilities in Joomla can accomplish a lot.