How do I add classic enemies similar to the ones in games like Mario, Megaman, Sonic etc.?

I'm making a platformer but I'm struggling with implementing enemies. This guide (https://www.construct.net/en/tutorials/adding-classic-style-movement-531) seems to give me a general idea how to do it but I'm having an issue. I can't use the Simulate Control option for more than one sprite for whatever reason and I'm already using it for my player character. Any help? Are there any alternatives to make these types of enemies that just walk back and forth?

You didn't really describe the issue that you are having with multiple sprites, what's the issue? Tutorial looks good and would allow a player character.