How do I know what version app I have?

iOS: 

1. Tap Account in the bottom-right corner of the screen.
2. Scroll down and select About.
3. Your app version appears at the bottom of this section (it starts with v).
    

Android: 
1. Tap Account in the bottom-right corner of the screen.

2. Scroll down and tap About.

3. Your app version is shown at the bottom of the page.