- Select the part you want to make into a bumper, and open up the code builder
If it is made of multiple parts, make sure you merge it.

Put an
When touched by a playerblock from Event, followed by achange player position in plotfrom Player. Using the drop down menu, change it to "by" and type the input into the direction you want to knock the player into. In this case it is "-10" into the "z".
Press play to see you knock off direction if you.. Bump into the bumper!