1. Take photos with your girlfriend in plot mode, and * * * take 5 photos for archiving.
2. Click on the archived photo 5, and the title appears "I can write something on the back of the photo".
3. Click on the photo to write.
You can adjust the font, color, size and other parameters when writing. Please note that this method is for reference only, and the specific operation should refer to the game update changes.