Dotpost is best accessed via the web app. To make it easier to do this you can add the website to your home screen on your mobile.
Android
- Open Chrome for Android
 - Open Dotpost (https://www.dotpost.com/login/) but don't login yet
 - Open menu (three vertical dots located in top right of screen)
 - Select Add to Home Screen
 - Confirm by selecting Add
 
Other Android browsers also offer this functionality.
DeleteiOS
- Open Safari browser
 - Open Dotpost (https://www.dotpost.com/login/)
 - Select Share menu (rectangle with upward arrow)
 - Select Add to Home Screen
 - Confirm by selecting Add
 
Dotpost will now appear on your home screen making it easier to access.