After you attach the axillary handle to the Black Decker MTC220 20v lithium ion 3-in-1 trimmer/edger and mower, you need to then. 1. Push on both sides of the upper house housing and push the handle on. 2. You can press the orange button to move the handle up or down or to adjust the section accordingly. 3. You can easily move whenever you want with the mower and adjust them accordingly. 4. If you keep the mower clean, you must first remove all the parts slowly or first remove the battery and then wash your mower easily.