I have the same problem, try and put in any html (like P and BR tags) and the editor strips them out.
So, I did as saltwater said, still no ‘HTML’ button.
I tried putting ‘code’ into different places in the menu, no difference.
I must say, the removal of HTML tags is a *REAL* step backwards IMHO, it was great to be able to put in text and type away, then go into the html and make tweaks.
It’s frustrating that WP has been ‘dumbed down’.
Please tell us how to get the html back.