Hi HaoSun,
If your intended outcome is like what the image below looks like. You can create a solid shape by choosing the shape you intend to use from the Shapes box and then drag it wherever you want on the picture. Click Fill, select Solid color, and then choose your desired foreground and background color.
If the steps above doesn't work, check the latest Windows updates for your device and see if it helps. If you're on a Windows 10 device, you can check for updates by selecting the Start button, and then go to Settings>Update & security>Windows Update, and select Check for updates. If Windows Update says your device is up to date, you have all the updates that are currently available.
Let us know if you need further assistance.