The best way to get started is just selecting a couple seconds for the previous week. You can always go back and delete the ones you don't like. This gets you comfortable with 1SE and having fun right away!
Go into any day with a camera icon on it. This tells you there's video there you can select from.
Once inside a day, you have a couple of great options. You can add a second (or two if you have a PRO subscription) or write in your journal. We're going to cover selecting a second of video. Tap the blue square that says "ADD SNIPPET".
You'll now be taken to our media center which shows all the videos, Live Photos, and photos you have available. We prioritize videos from that day by putting them at the top. You can see the videos for Thursday, January 24th 2019 in the example.
Once you've selected a video you want to use, you'll see our snippet selector screen. This allows you to do a ton of great stuff with your video. Like "Rotate", "Crop To Fill" (zoom in to make the video fill the screen), and more.
You can use the arrows on both sides of the video scrubber to go frame by frame in order to find that perfect moment. Don't forget, you can preview your second by pressing the "Preview" button on the bottom left.
Once you have that perfect moment found, simply tap the blue "Trim" button on the bottom right to save the second.
Once you've selected your second, it'll be saved on your day and automatically favorited. Don't worry, you can always replace or delete a second by tapping the (...) icon on the bottom righthand corner of the thumbnail.
TIP: Add a caption or location info to help remember that moment.