Here you get all the Infos you need to create and operate the Widget.
Create the Widget
Creation depends on your Android Version and the Launcher used. Most common Way is to long press a free Part of your Homescreen and select Add Widget from the Popup-Menu. Using the Menu Button often allows to add Widgets to your Homescreen too. On Android 3.x and higher there is a Widget Tab in your App Drawer. Long press the 1st Picture Wall Calendar Widget and drag it to your Homescreen.
The Configuration App comes up and allows you to setup the Calendar.
Tap on the Arrows left and right of the Month / Year (tall and square Widget) or at the Bottom of the Picture (wide Widget).
Open Configuration App manually
Tap on the Picture on the Picture Wall Calendar Widget or start the App from your App Drawer.
Only Android 4.1 and higher. Long press the Widget and resize it with the controls showing up. Some Launchers requires to select the Resize Function first (e.g. Nova).
Open Default Calendar
Tap on the Calendar Texts below or left of the Picture.
Open Birthday Contact
If a Contact is shown (Caption and/or Picture), by tapping on the Month / Year / Caption Part or on the Gift Boxes you get to the Contact directly.
Long Press the Widget to be removed and move it over the Trash Can or the X showing up on your Homescreen.