The airport Boston Logan has four terminals on a large U. Follow the signs to the baggage pickup areas downstairs. Terminal B has two pickup areas. The various pickup spots are just outside. Start looking for signs before you go outside. Walk back and forth until you find the correct area. They are fairly well marked. The bus info may be listed on a display at its particular spot with the "arrival time". The bus starts at terminal A and proceeds to E (There is no D). It may not display "arrival info" until it is near the airport. If there is a bus number then it will show that. If I understand correctly, you are looking for the Concord lines bus to Concord NH where you change buses to get to Lincoln.
From 2019
https://concordcoachlines.com/wp-con..._v3-042221.pdf