In PBU you can change various button a guest will see to one of your own design. This tutorial will teach you how to add those buttons to PBU. You'll have to create the button images separately in a photo editing software like Photoshop. The default PBU buttons are 224 x 68 pixels, and new buttons will be automatically resized to these dimensions, unless they are set to a scale other than 100%. The buttons have a normal state and a pressed state. If you don't make a pressed button graphic your button will not change when pressed.
For great quality buttons we usually make all custom buttons 700x175 (Accept, Edit, Photo, all Share buttons, etc.) and the Home button 175x175.
Open PBU settings by clicking S then navigate to the Misc. tab. In the Advanced Options section click Edit Custom Buttons:
In the pop up window click open file on the right for each of the buttons you would like replaced. The buttons can be any image file format and should be rectangular in shape or other shapes with transparency. You can find more buttons to customize by clicking the blue buttons at the top. The buttons have a normal state and a pressed state. Note: If you don't make a pressed button graphic your button will not change when pressed. Select Clear All Buttons to remove added files from all buttons.
The default PBU buttons are 224 x 68 pixels, and new buttons will be automatically resized to these dimensions when the main button scale is 100%. This scale can be adjusted at the bottom of the Edit Custom Buttons window to create bigger or smaller buttons:
Click OK twice and then you're done! Enjoy your new buttons!