Thanks for your order of office 365
Please convert your received code into your office 365 account username and password first.
You should have received a code like:
(this code if for illustration only. You should have your own).
Please use its first five characters and convert it to a username like this:
The rest part will be password:
(Again, this is for illustration. Please use the code you received to convert your own username and password)
Use the email address and password you have converted to login. You can change the password by yourself. Then please follow the online instruction to download office 365. This MS account includes already activated office 365. NO key is needed.