How do I enable Accessibility access on Mavericks, Yosemite or El Capitan? (Mac)

1. Choose System Preferences… from the  menu
2. Choose Security & Privacy from the View menu of System Preferences
3. If locked, click the lock icon at the bottom left and enter your admin password
4. Click Accessibility in the list on the left
5. Check both TextExpander and TextExpander Helper in the list on the right
6. Close System Preferences
7. Launch TextExpander

For more visual instructions see our blog post. For problems in Yosemite where TextExpander Helper does not appear in the Accessibility list, see this article.