How do u program wall jumping or wall sliding?

I've tried asking this through another topic, but everyone just completely ignored this part.

What you want to do is program it so that your character detects when he is touching a wall (left or right specifically) and change his behavior based on that knowledge. In the case of wall jumping, it's just a matter of permitting it only in that case. Sliding is just a matter of changing animation and perhaps adding some friction or reducing the "falling" speed.

I've tried doing that but i can't figure it out cuz once he hits a wall he always thinks he's touching one u can see wat ive done here

There's two resources I can think of off the top of my head for you.
One is my own: Search for "Demo-" on StencylForge and find my "Platformer 2" example to see how I do wall-jumping in my own games. It's fully commented so you can see the thought process.

If you prefer to see the development of a wall-jumping code as it goes, check out Abigayl's second tutorial set. The second part of it deals almost entirely with a good wall-jumping code: http://www.kongregate.com/games/Abigayl/stencyl-2-0-tutorial-2-jumping