A. 1. Force close the app by swiping up from the bottom of the screen (or double-clicking the home button) and swiping the app off the screen. 2. Restart your iPhone to clear any temporary glitches. 3. Open the app again to see if the issue is resolved.

B. 4. Check for updates in the App Store and install any available updates. 5. If the black screen persists, consider resetting the app settings by going to 'Settings' > 'Soulear' and looking for a reset option.