Board Thread:Support Requests - Getting Technical/@comment-4378897-20150123030819/@comment-5558012-20150126145805

The help page is both correct and incorrect. The button still exists in the old visual mode (Classic Rich-Text Editor) but not in the new visual mode (VisualEditor). This button either won't be used in the new visual mode or it just hasn't been developed yet. If you want to utilize the button, change your editing preferences (Click on user icon in the top right -> My Preferences -> Editing).