We purchase the account through the link ( Office 365 for life )
Important instructions before activation:
https://login.microsoftonline.com/
Activation steps:
1- Log in with the account sent to you
 
2- Type the password sent to you
 
3- Change the password to a new password of your own.
 
4- Install Office 365 on your device
 
 
5- Log in to Office 365 with the same email sent to you and the new password that you changed.
 
Congratulations, your activation has been successful.