The following is from my manual and should work on your coach.
First, make sure your ignition key is off. If on, you cannot operate slides.
Then, retract MH hydraulic leveling jacks.
Locate slide-out room hydraulic pump on lower curbside front frame. (Normally in front of steps.)
Use 1/4" Nut Driver on bottom of reservoir cap to turn the release nuts on the solenoids counterclockwise. Do not exceed 4 1/2 revolutions. Damage to solenoids may result. The room may move slightly when valves are opened and internal pressure is released. Lineup 6 to 8 people equal distance along outside wall. Do not push on the flange. In synchronized movements, push the room in with repeated attempts. Close the release nuts when the room is fully retracted. That ends the retract from the manual. After in, I would use 2 x 4's cut to length behind slide on floor, cut to length to hold slide in while driving. I not only have done that, but I climbed under the coach and tied the slide in so it would not come sliding out when I made a turn.
Roy Warren