NOTE:YOU CAN’T REPLY FROM THE APP.
=>After the app has successfully installed open it and click on GO IT
=>it will ask you to enable accessibility, simply click on Enable, next to the SSH Whatsapp app.
=>click on I Understand, and continue for use this app.
=>Now, In next screen select option, where you want to hide last seen while reading messages. Simply click on Groups and Users, if you want to read whatsapp messages from groups and persons, or select option of Only users or only groups according to how you want it.
=>Now head back to the main screen,you will see all wahatapp massages,which you can read without opening WhatsApp,and all your last seen will not be changed.