How to add WPML language switcher in default header

Hi. I’m currently using the Gaming Demo, and do not use any Cloud Template for header. I’d like to add a WPML language switcher in the header. How can I achieve that?
I tried to add the switcher in the main menu for header. But it sometimes did not show up or sometimes did not provide a dropdown. Please help with this.

I’ve figured it out on my own. Need no further instruction.