@Huibrecht0 Log in to your account. Click at the top of your dashboard marked "Messages". You should see it there.
Also, if you have gotten an email from Airbnb asking you to respond, just click on the RED BOX in that email and it should take you directly to that area in your account to send a message. If that doesn't work, go to Facebook, click on Airbnb Help or on Twitter, or call them. But the email should absolutely be working for you to click on the option.
Under my name at the end of this post, there is a link on "HOW TO CONTACT AIRBNB". Use that to call them if all else fails. They are open 24/7 and can help you along the way.
If you feel that me or another host have helped you, feel free to click on the "thumbs up" button at the end of any post. Thank you so much.
Aloha, Momi
Great way to contact Airbnb or via Twitter at AirbnbHelp / Facebook