Ports is an important feature needed for players to be directed straight to your server, adding a new port is really simple and easy. (If you are running a Java x Bedrock server and you want Bedrock players to use one of your ports, make sure to edit the geyser config!)
Adding A Port:
Make sure you are in your control panel like shown in the image:

Once on the control panel, click on the 'Network' button on the sidebar:

Once on the 'Network' page it should look something like this:

On the 'Network' page, press the 'Create Allocation' button:

Once pressed you will be generated a new port (this is not customizable and is random):

Now you have 2 or more ports! However only one can be used! To make a port a 'primary' port (the port people use to get directed to your server) you must press 'Make Primary' on the right of the port you wish to be the primary port. On the contrary, if you want to delete a port, you can press the trash can icon that is to the left of the 'Make Primary' button:

If you have a Java x Bedrock server, make sure to change the geyser config to the port you are using for your server otherwise Bedrock players will not be able to join!

(Make sure to press save changes too!)
Note: Before creating a new port or editing the geyser config, turn off your server, then edit, then turn your server back on! This ensures everything saves correctly!