which verb or verb phrase signals an inappropriate shift in mood? There are a few more steps to starting up a ride-on lawn mower that there are for a push mower. First, sit on the seat and will you engage the safety device. The mower won't start without someone sitting on it. Next, open the choke by lifting the lever all the way. Press the brake with your foot. After that, turn the key. Once the engine is running, lower the choke lever slightly.