That's mostly a networking question, but...
The machine the Confluence application is running on has an IP address. Confluence listens to messages sent to that address, on a port. Anything that sends messages to that IP address and Port will be replied to by Confluence. Let's say you've got an IP of 192.168.1.64 and Confluence is listening on a standard port, 8080
The most common messages here are web browsing. So, if your users go to http://192.168.1.64:8080 , they will see Confluence in their browser.
However, there's a very good chance that your machine has some form of firewall on it, which will block the others from getting in, and you probably want something a bit more name-based (http://confluence.myorg.com), in which case you'll need to think about DNS. And that IP address is local to your network and you might want externals to get in. And your network address can change if it's using DHCP. And you'll want to think about network and information security. And. And.
Short answer - you probably need to talk to your local networking people.
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