First thing to do is to is interact with the Portal Hub this will bring up the Hub menu.
Hub Menu
The first button on the Hub Menu will activate a search which will connect to and turn on all portals it is connected to within actively simulated chunks (Chunks within your simulatiuon distance).
The second button on the Hub Menu lets you edit your portals from the Hub and set their destinations more on that below.
The third button will reset the connections by turning off all portals it is connected to and delete the exsisting connections of the hub.
The fourth button will exit you out of the Hub Menu, but that is also done by clicking/tapping on the X in the top right corner of it.
Edit Menu
This menu is gotton to by pressing the second button in the Hub Menu. It will show a list of all portals connected to the current Portal Hub you are acessing. These buttons will appear with the name of the assigned portal. Clicking any of these will bring up a secondary edit menu. The back button at the top will bring you back to the Hub Menu.
Portal Edit Menu (Edit Menu Secondary)
This menu allows you to choose whether you want to change the portal's destination, or the Portal Core settings. The first button will allow you to set the portal's destination. The second button will allow you to go into the Portal Core's Portal Menu (see below in Portal Core Menus). The third button will bring you back to the main Edit Menu.
Set Destination Type Menu
This is possibly the mod's most powerful feature. You can set the portal's destination either to another Portal Core in the system, or any coordinates in the dimension you're in. The first button will open up a secondary menu to set the destination of this Portal Core to another Portal Core. The second button will open up a different secondary menu which allows you to set the coordinates for you to land at.
Set to Portal Menu (Set Destination Type Secondary #1)
This menu will show you a list of the other Portal Cores in the system to choose from. Pressing back will sned you back to the Set Destination Type Menu, and pressing any of the buttons labeled with a portal's name will set the destination of your current portal to that Portal Core.
Set to Coordinates Menu (Set Destination Type Secondary #2)
This menu allows you to enter the coordinates you wish this portal to teleport to. The first input box is for the X coordinate, the second input box is for the Y coordinate, and the third input box is for the Z coordinate. Press the 'Submit" button to set the destination to the provided coordinates. If no number is inputted, it will default to 0.