There are more editing fields available to you than you see on first login. The Screen Options area allows you to choose which Post Fields are displayed or hidden from your editing area, which allows you to minimize clutter and customize according to your needs.
You’ll find the Screen Options tab at the very top of your screen, and if you click on it, you’ll see a list of available editing boxes that you can use. Check the box for each Post Field you want displayed, or uncheck the box to hide that module. Click the Screen Options tab again to close the tab.
Once you’ve customized how editing screen, your options are saved so you don’t have to select or hide them again next time you log in.