I typed my reply into the empty box at the bottom of the thread as shown.
But I cannot find the Post button.
There is a Quick Reply button
I click that and a new empty box appears and my text is grayed out.
How do I get my text into the new white box?

OR

I click the Reply button. It asks me do I want to leave the page.
I can't click Leave otherwise my text will be gone and lost.
I click Stay and I am back where I started, My text is there but there is no button to post it with.

What do I do next?