Before I start explaining how to change what port emule is using. I want to say that certain servers require you to forward/setup emule with a specific port. You should check the servers FAQ for the ports you should be working with.
Since you are reading this guide, I'm going to assume that you have eMule installed. Open up eMule.
Click on the Preferences button at the top of your screen. Clicking preferences will open a new window full of options.
On the left hand side of the preferences screen, you should see a Connections link. Go ahead and click that now.
This page allows you to specify which ports eMule uses. eMule uses two ports one for TCP protocol and another for the UDP protocol. Those ports are specified in the TCP and UDP boxes in the Client port section of this page. Go ahead and specify the ports to use with eMule. You might just want to leave these ports set to default. Really it is up to you. While we are here, take a look in the Capacities section. You should see two boxes here the download and upload boxes. These boxes define the speeds that you should be uploading or downloading at. The limits section of this page sets the speed limit of your downloads and uploads. Make sure that you check the settings in both of these sections, they may be limiting your speed. Those settings should be set differently depending on what the speed of your internet connections is. You might want to try changing them until you see the best performance from eMule. When you are finished with these changes click the Apply button at the bottom of the screen. Do not close this window.
Now go forward the ports you entered into the TCP and UDP port boxes. You should specify the TCP protocol for the port you entered into the TCP box. The UDP protocol should be specified for the port you entered into the UDP box. Remember that you also need to open both of these ports in any software or hardware firewall you have running. Check our Firewalling.com page for some common firewalls. Once you think you have forwarded those ports in your router and opened them in your firewalls, come back here.
Switch back to your eMule preferences connection page. Click the Test button to see if you properly opened those ports.
When the ports have been properly configured you should see the page that is dISPlayed above.
Well that is it. You are done.