Head to the shop to pick up the package. As soon as you're out, a thug will snatch it from you. Give chase until you corner the guy. Beat him down and recover the bag. Next, head to the marked location and find your way inside the restaurant's kitchen.
Once there, you have to plant the bug in the AC vent. You still need to calibrate it so move your analog sticks until they hit the correct spot and for the calibration bar to completely fill up. Once done, pick the locked door to exit the restaurant.
Bugging the place