Okay, well I think that script is actually already rotating the character, then moving based on that rotation.
Please read this post to edit your post with code and for future posts: Using code tags properly
Someone else was asking a similar question earlier today, and they were also new. The thing is, if this is connected to other scripts and deals with the camera and so on… It’s not always easy to explain 1 thing, if it can / does affect other things.
Just to double check - do you want to have that the character can move a direction different from the camera?