1. Click on the More icon present in the top-right corner of the tab.
2. Click on Get add-ons.
3. Click on the search bar at the top and type "Signature in Google Forms by Bolo".
4. Click on Signature in Google Forms by Bolo | Sign PDF docs from the search results.
5. Click on Install.
6. Click on CONTINUE
7. Click on the Google account you want to link the installation to.
8. Click on Allow.
9. Click on DONE
Step 9 screenshot