This is applicable on most common Husqvarna mowers.
Gasoline fueled mowers (rear driven model): Pull the drive bail in the direction of the handlebar. Picture below.
Gasoline fueled mowers (front driven model): Pull the drive lever up. Picture below.
For electric mower: Start the drive on the wheels with the speed control lever on the left side of the handle. Move the speed control lever forward to increase the speed and rearward to decrease the speed.
Before you pull the product rearward, disengage the drive and push the product forward approximately 10 cm.
Release the drive bail/lever to disengage the drive, for example when you go near an obstacle.