The technique starts by placing a ramp with a wall in front and above, then depending on what direction you want to move, two stacked walls are placed to the left or right of your ramp, as you reach the top of the ramp - but before you make contact with the wall - jump and place a floor and another ramp as you face the walls you just placed and continue moving forward.
The technique for the ninety is a lot more involved than the basic ramp push so be sure you practice this in the playground gamemode so you can reliably pull it off without slowing your character’s movement down. The technique starts by placing a ramp with a wall in front and above, then depending on what direction you want to move, two stacked walls are placed to the left or right of your ramp, as you reach the top of the ramp - but before you make contact with the wall - jump and place a floor and another ramp as you face the walls you just placed and continue moving forward.