Tutorial problem :/ help me

I can only move left and right, how can I solve this?





I'm using this tutorial.
help me please
https://www.scirra.com/tutorials/253/ho ... tform-game

thanks

In the tutorial characters walk above (on the) solid 'ground'. It is a 2D game engine.

https://www.youtube.com/watch?v=GcqGcsEg6Ys

You try to make the characters walk buried middle in the solid 'ground'.