The floating bar won't move the Save disc icon over to reveal where the Send button used to be, and it is not hidden beneath arrows. Consequently, I cannot send anything I compose. A.

Repentant emailers everywhere: Gmail just enabled an “undo send” button. SEE STEP BY STEP INSTRUCTIONS, WITH PHOTOS, HERE Remember that time you wrote something disastrously personal to… ...

The trick is to tap and hold the Send button (the arrow icon on the right) once you've composed your message. This will bring up a panel with some suggested times later in the day.