From the app:
1. Find the Photos section of the app
2. Choose the album you'd like to add photos to
3. Then click the Camera icon in the top right corner
4. If you haven't already, grant the app permission to access your photos
5. Then select photos from your gallery & hit Done in the bottom right corner
If you'd like your fans to see the image, make it 'Public'
From the web:
- Login to your account & select Photos from the left menu
- Select the album you'd like to add photos to
- Then click Add Photos.