I tried installing LastPass in Safari, but nothing seems to happen.

Please first check to make sure LastPass installed into Safari via Safari >> Preferences >> Extensions Tab. LastPass should be listed and a checkmark visible in the box next to Enable LastPass. 

If LastPass is listed and enabled, please check to the left of the URL bar for a grayed-out * icon. Click on this, and log in to LastPass. The icon will then turn black to indicate you have logged in. 

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