A family of Microsoft word processing software products for creating web, email, and print documents.
The picture formatting tools are on the Picture Tools tab on the ribbon, which appears only when you have clicked on a picture to select it. In that tab, the sizing and cropping tools are all the way at the right end.
You can also drag the handles on the picture's corners to resize it, or right-click it and choose "Size and Position" in the menu to open a dialog box. The cropping tool is only on the Picture Tools tab.