Download the *.apk file of your App and copy it to your local storage on the PicoPix.
Start the “Media Folder” Application on the Homescreen of your PicoPix and navigate to the *.apk file.
Doubleclick and follow the instructions on the screen to install it. After successful installation it will be available under Apps on your homescreen.
Note:
You need to active “untrusted sources” in the settings menu.