Section B4 for the one direction concert is one of the middle floor sections about 30 rows from the main stage and about 20 seats from the catwalk.

Section B4 Row 1 Seating Chart
Gillette Stadium One Direction seating chart (September 12, 2015)

Row 1 is the first row in this section, closest to the main stage and just behind section A5. There are 24 seats in this row with seat 1 closest to the catwalk.