If you are working with location-services turned on, please follow these steps. If not, see details below.
1. Go into the album view.
2. Tap the “collage” button at the bottom-left of the screen.
3. Tap to select the photos you wish to put into the collage (2-6 photos).
4. Tap on the “Collage” button that now appears on the bottom center.

If you are working with location-services disabled:
1. Tap the “collage” button at the top-left of the editor.
2. Select how many photos will be added to the collage.

You cannot delete a photo directly from Photogene. Apple does not allow 3rd party apps (such as Photogene) to delete photos.
1. Open the iPhone’s native photo viewer (sunflower icon).
2. Go into the “camera roll” and tap the box-with-arrow icon at the top right of the screen.
3. Tap to select the photos you wish to delete.
4. Tap on the “Delete” button that now appears on the bottom.
Please notice that only photos you’ve taken with the iPhone’s camera can be deleted. Photos imported via iTunes or photos in your iCloud’s photo-stream cannot be removed.

1. Go to the settings app and select “Location services”.
2. Switch “Photogene” to “ON”.
3. To put the changes into effect, you’ll need to force close Photogene. Double-tap the home button and then long tap on the Photogene icon and press the little red circle.
4. After you re-launch, press the “back” button at the top-left to pick a photo to edit.

All the edits you make are saved inside Photogene’s internal database, while to original file remains intact.
You can export the edited photos into your camera-roll, as new pictures:
1. Go into Photogene’s album view.
2. Tap the “select” button at the bottom-left.
3. Select the photos you wish to save.
4. Tap on the “Export” button that now appears at the bottom.
5. Select “save to photo library”.

You should try to logout from Facebook and then log-in again.
Tap the “logout” button that appears next to the Facebook entry in the export menu. See screenshot.

Sometimes it takes a while before Photogene syncs with changes you made in your photo albums.
To force a sync, you should force-close Photogene and re-launch it.
Double-tap the home button, then long-tap on the Photogene icon until you see a little red circle above it (like the underground logo). Press this circle. See attached screenshot.

I this still doesn’t help, try restarting your iPhone.

In order to retrieve your saved photos, you’ll need to use a computer application that can connect to a digital camera – such as Picasa (free on Windows and Mac) or iPhoto (Mac only). When the iPhone is connected to your computer, it represents itself as a digital camera. These applications will detect the iPhone and allow you to retireve saved photos from it.

Nope, sorry.
Apple does not allow 3rd party apps such as Photogene to overwrite photos – only create new ones.

It’s not possible to edit photos directly from Dropbox.
But: you can save photos from Dropbox to the local library and then edit them with Photogene. The photos will appear in the “saved photos” album.
To do so, open the photo in the Dropbox app and select “save photo”. See screenshot below.