Can't engrave sketchup2015

hello guys,

So I’m designing a computer case for a friend of mine and I was at the stage where I wan’t his name (and the name of his wife) engraved on the front.

but when I use this tutorial the text disappears from the good side of the case (the front), and is visible on the wrong side of the case (the inner parts)
How can I fix this?

nvm… fixed it already .-. had to explode the face I wanted it on too