On Facebook I can normally post a message to a friend's wall (timeline) using the "Write something to <first_name>..."box on their page.
But now, when I open a friend's page there is no such box on their page. I tried both Chrome and Edge browsers and even Facebook for Android, but the box still isn't displayed on their page.
I know that I can write them a private message, but I prefer to write a public message congratulating them on their achievement so it is visible to their friends including our mutual friends.
Is there any way I can still write a message on their wall?