2. upvote or downvote the post using the two arrows.
3. Write your reaction to the post.
4. View comments for the post.
5. Swipe left/right to go to next image.
6. Double tap on the picture for zoom
7. Save the picture to your sdcard
8. Choose your sub-reddit.
By default the image quality is determined based on the device memory capabilities. If you believe your device can handle high quality images (Eg: Tablet) set your image quality to High in settings.