First you need to Switch on your device on which you like to watch HBO max like your your smart Phone, laptop, Firestick or any other streaming device.
Now go to the play Store and login with your gmail id and download HBO Max App or you may also try top open hbomax.com/tvsignin in any browser and check download options.
Once you install the app, open it and click on the activation button, now copy the code.
Now you have to visit hbomax.com/tvsignin and login in your account. If you dont have create an new account.
Go and fill the basic details asking at the time of signup.
Select your streaming device and your cable provider.
Now enter the code you have copied earlier when asked for the activation code.
Finally, your account is avtive and you can watch any stuff you like from different categories