Once you’ve added your username and password (if you use one) in the preferences, just click the button Instafari adds to your toolbar to add an article to Instapaper. If the submission is successful, you’ll see a checkmark; if not, you’ll see a thumbs-down.
Safari Extensions: How to Enable Extensions in Safari 5.0.0 -
NOTE: This applies only to Safari 5.0.0, not newer version of Safari like 5.0.1. In 5.0.1 and later, the Extensions pane of Safari’s preferences should be enabled by default.
For those who haven’t already:
1) Make sure ‘Show Develop menu in menu bar’ is checked in the Advanced pane of Safari’s…