Yes, making your character speak is just like adding any other sound. It isn't too demanding, nor is it difficult to set up. All you have to do is, set up the event that plays the sound. I assume you already saw some tutorials for adding sound but if not, read through this:
https://www.scirra.com/tutorials/181/ad ... ners-guide
If you are trying to animate the character so it looks like they are speaking, you simply need to trigger the speech animation when you trigger the sound. I haven't tried it yet but, I think it looks pretty difficult to get a lip sync effect so, you may just want to keep the animation generic. Just a suggestion.