Week1-assignment3 submit button not coming

Submit button is not showing in the notebook.
I refreshed multiple times and tried at different times of the day but it’s not coming up.
What should I do?

Try getting a fresh copy of the notebook, using the “Help” menu.

There is also a topic about this situation on the FAQ Thread which is worth a look. The point is that one inhibitor of the rendering of the Submit button can be extremely large memory footprint of the notebook because of running the training for a lot of iterations. The way to remedy that is “Kernel → Restart and Clear Output”.