Under Portfolio>Sharing,  click on “Accounts I’m Following” on the left-hand panel.

The center panel, above the Account List has a section to enter the code for the Account to be shared on your platform.    Enter the code, then click “Add

On the bottom, right panel box under “Options“, make sure to check boxes:

     Show in Journal
     Show in Staged Orders
     Alert me about this (Needs permission)

Your device’s settings need to be permissioned for Alerts.

Finally, for easy trade identification, select a color identifier from the dropdown box in the right corner of the Options box.