To edit your email account settings:

1. Open the left side panel with the button in the top left of the screen (3 lines).
2. Scroll down and then tap on the "Accounts" button.
3. Tap on the settings icon (cog) beside the account name to edit the settings.
4. Tap on each of the blue heading buttons to display different options.

Tap on the "Test" button in the top right to test your account settings.