I didn't know you could save!!! I thought that if you went back to the thread you wold see your message but the type was faint. Click on it and you could add to it or post it
It is best to type your post in 'Notepad' if you use Windows, or in 'Notes' if you use iOS and then save it in your own device.
Then when you want to post it, simply copy the text from 'Notepad' or 'Notes' and paste it to wherever you want to put it on the forum.
I often use this method ...