If your school or organization manages students Chrome browsers, they may have blocked the installation of all Chrome extensions by default.
In order to use Ponder, your Google Classroom Admin or G Suite Admin will need to allow the installation of the Ponder Chrome extension with a few clicks.
This Google Support article describes the steps needed to enable the extension:
1. Expand the section "How to select apps and extensions" and follow the directions to identify the Ponder extension in the Chrome web store.
You should be able to find the Ponder extension by searching for "ponder". Just to be sure, this page is for correct extension in the Chrome web store.
2. Expand the section called "Choose how to install apps and extensions" and follow the directions to allow the installation of the Ponder Chrome extension.
If you have any issues, contact support using the "Submit a Request" link at the top of the page.