"Use Shift+Alt+F11 (HighlightUsages), to easily see usages of a variable or another symbol.
Use Ctrl+Alt+Up and Ctrl+Alt+Down to navigate between highlighted occurences.
Press Escape to remove the highlighting."
Why would the commands to navigate be Ctrl+Alt, when the command to activate is Shift+Alt? Both should be the same either Ctrl+Alt or Shift+Alt, not mixed usages.