To enable navigation without a mouse, you need to turn on the high-contrast color
scheme in your Preferences settings.
To turn on high-contrast color scheme:
Navigate to Preferences by clicking Your avatar > Preferences.
Click General Preferences.
At the bottom of the page, click On in the high-contrast
color scheme field.
If you are using a Mac OSX environment, you also need to turn on all "All
controls" for full keyboard access by naviagting to System Preferences > Keyboard > Shortcuts and select All options at the bottom of
If you are using MAc OSX, you can enable voiceover capability by navigating to System Preferences > Shortcuts > Accessibility and select Turn VoiceOver on or off