Please read carefully:
Unsplash has officially closed their source endpoint. The only way to access this feature now is to acquire a free API key through Unsplash.
1. Sign up/Login to Unsplash
2. Expand the menu to find Product>Developers/API
3. Go to 'Your Apps.'
4. Create a new application, find your access key then copy it. Glance will ask for it when you hit Apply below.
5. Your API key is only ever stored on your device. Broank doesn't access it, nor can see it in anyway. Shortcuts may prompt you for permission and may look like the file is being sent somewhere, but it's simply just being referenced from the Glance settings file.