as @wendylois says, she has the BT app installed on a phone. I would expect that a branded app would be supplied pre-configured with that brand's mail server address, preferred protocol, and port numbers: it would prompt for the user's personal account details like name and password - all to minimise the effort and risk of errors of manual configuration.
But she says that the other words, used in connection with the process on a desktop computer, are unfamiliar to her - and under those circumstances, it is the responsibility of the adviser to find a form of words that enables the listener to understand the concepts being talked about.
When I was giving this sort of advice professionally (I'm retired now), I developed this explanation for the difference between 'downloading' and 'installing' software.
It's like coming home from holiday. You arrive at the station or airport, and everybody (people and luggage) piles into a taxi. The taxi driver takes you home, and leaves the luggage on the garden path. (That's downloading)
Then, you take the suitcases inside, and start unpacking. The dirty clothes go in the laundry basket, the maps and guidebooks go in the bookcase, the souvenirs go on the coffee table, the photographs go on the mantelpiece, and the half-eaten British Rail sandwich goes in the trashcan. (That's installing)
Feel free to use it if you like it.
