To be able to drop Projects to Allihoopa you have to have the Allihoopa app installed on your iOS device. You can download the Allihoopa app from the App Store for free.
To drop a Project to Allihoopa, tap the Settings button:
Tap "Sound File":
Then, select the Allihoopa app from the menu that appears.
Note that the Project is exported as an audio file, i.e. the original editable Project file is not dropped.