How do I get player to move left/right

Hi everyone

Please bear with me as im very very new and amatuer!!

Ok trying to make a platform game!!

I have the player set up too:-

Player-is on floor platform-Jumps (this works fine)

Keyboard-A is down-player platform pressing right

same for D (These dont work)

Player behaviours- Scroll to and platform

and default controls-NO

Any help??

do the basic tutorials first, something like this:

scirra.com/tutorials/37/beginners-guide-to-construct-2

Also, upload your capx file to dropbox or something and attach it so people can look at it better