Add to Chrome.
Click 'Add extension' above.
The installation process should take less than a minute.
Next, you'll Create an Account.
When I run a security check, it does not check my shared items or shared folders. Is this expected?
Yes this is expected.
The security check will only check against your personal entries, not any shared logins or shared folders (including family shared folders).
However, the Security Challenge does check sites stored in Shared Folders to see if they were impacted by the Heartbleed bug and alert you to whether your passwords need to be updated for those sites.