Arrival 1 & 2 to desk
Walk down the small (black) ramp and turn right, keep walking between the shops. When you see Burger King, turn right, pass Victoria Secret Shop (left side) to Arrival 3. Behind the staircase, in front of the lockers, you'll find the welcome desk.
Arrival 4 to desk
Turn left and walk straight into Arrival 3, to the lockers behind the staircase.