Cannot submit Week-1 Gradient checking assignment

There is no blue colored ‘Submit Assignment’ box in the Gradient checking jupyter notebook.

I followed the solution on the last comment of this link and it worked.
to summarize solution provided in that link
“Just save your notebook (it gets autosaved though), and shutdown kernel. Close the tab and reopen the assignment. Worked for me.”

It’s great that you were able to find the solution on your own. For anyone else who finds this thread, there is also a topic about “No Submit Button” on the DLS FAQ Thread.