How to add Photos or Videos
PicFrame for Mac shows your Apple Photos on the left side of the app. You can either click each photo you want and preview them in many frames or select a frame first and then drag and drop them to the exact location you want on the frame.
To add photos that are in the Apple Photos app you can drag and drop directly from Finder, or other apps in to a selected frame.
How to change the ratio
You can type in ratios in the right hand menu or select common ones from the menu bar at the top of the screen under Frame > Ratio.
How to apply filters, add shapes or rotate a photo
Once you have added a photo to a frame you can add filters, shapes or rotate and mirror the photo by clicking on it and choosing the corresponding item from the menu.