In order to use the Chrome Extension in Salesforce you need to do the following:
1. Open the Chrome Extension on a LinkedIn profile
2. Select settings
3. Select Salesforce
4. Check "Show sidebar" under Salesforce
5. Navigate to a contact on Salesforce and you'll now see a "View Personality" button next to the contact's name (you may need to refresh the page if it's not showing up right away)
When you click "View Personality" the Chrome Extension will pop out and give you insights on the contacts personality.