Step 1: On the Raw Power Panel go to the 'Server Details' page. Here you can see your current ports (allocations) that are available for your server.
Step 2: As this page says, you will need to join our Discord and create a ticket on there to receive additional ports. We can give you as many ports as you need, and we always allocate 1-2 extra.
Step 3: Once the ports have been added, you will need to restart your server in order for the changes to take effect. After this your new ports will be added on the 'Server Details' page and are ready to use for your server!