You're in the "Library" module, not the "Develop" module. Pull down the toolbar at the top (either hover over the grey arrow top-center of the screen for a temporary pull down, or click on it for permanent) and then click on the "Develop" module.

You're in the "Library" module, not the "Develop" module. Pull down the toolbar at the top (either hover over the grey arrow top-center of the screen for a temporary pull down, or click on it for permanent) and then click on the "Develop" module. The same result can be accomplish by Ctrl+D (on Windows).