Now, you can run all the cells in the notebook that just opened by clicking on the play button. (Note: After running the first cell, you might have to restart the runtime).
(OPTIONAL)You can use my ngrok token or get one for yourself by registering on ngrok.com and replacing the auth token with yours.
Else, you can also select Runtime —-> Run All from the Menu bar.
Click on the link generated after executing the last cell.