How do I force object to move only left-right

I never learn english, so i hope you understand me.

How to force object to move only left-right without other direction. I made it to move object from left to right part of my "game" but he won't from that position move in direction from right to left. I mention that is in question enemy object, so he need to do that without any player impulse.

And why you make so hardly this manual making movement funkcion??? 

(Sorry for bad english)

Give the object eight direction movement behavior, and set the range of movement to only left and right.

https://www.scirra.com/manual/87/8-direction

Read that, it'll give you plenty of information about the movement behaviour

That wasn't helpfull. I read tutorial but still didn't help to solve the problem.

I don't have in my 8 direction option range of movement or to chose the movement.

I have only this option:

s15.postimg.org/piu2pv0nv/8_dire ... nction.png

s15.postimg.org/piu2pv0nv/8_direction_function.png

(is not the spam for sure)

See the image below:

http://prntscr.com/aass4g

Thank you, thank you, thank you a lot, lot! You save my life

Thank you one's more!

No problem, happy to help!