A on online guide to using a web-application on another computer networked with your machine would be pointless. Because by the time you read it, you've already done it.
In JIRA terms, look at the base-url of the service. Put it into the address bar in your browser. You now have a login screen.
If you have not set up any names/dns or routing, then your base url will probably need to be http://192.168.1.24:8080 (replace the 192...24 with the IP address of the server)
That tells me that either you've put in the address of the router instead of the JIRA server, or your network is configured to block access.
If you do not get a login screen, then your network is not configured to allow the connection. You will need to fix that yourself, we can't know how your network is set up.
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