You account is currently ’New’, as such i think Messaging others is blocked. Not sure what activity or how much activity is needed to level up your account so that you can then message the original poster
Click on the posters name ‘synlos’ and see if there is a ‘Start Conversation’ button
FWIW, a Yo popped up on an FB Fat Chance group yesterday. Lots of interest, not sure if it sold yet.
Also, may be smaller than a 19"
https://www.facebook.com/groups/114800132247/posts/10159342074282248/