Firstly your user name on the CC is @John-And-Cherie0 .
If you know the user name of the host you want to contact, you can click on their profile picture and you will see "send a message" and from there you can send a private message to that person.
If it's not someone who is already on the CC and you want to message a host from their listing you need to use the"contact host" but I think you have to enter dates to be able to do this. Just make sure you are only "requesting information" in which case the host has 24 hours to reply to you by either pre-approving, accepting or declining your fictitious dates.
According to @Robert-And-Ronda0, this wasn't a great experience when they tried it but it really depends on how helpful the other host wants to be.
Trying to contact a host via the usual social media groups is also a possibility.
All the best