You activate any "free" 1yr pers o365 as per HP instructions as its not an MS process, generaly it means starting Office frome a desktop shortcut then following the prompts to use/create an MS Account associated with o365.
https://h30434.www3.hp.com/t5/Notebook-Software-and-How-To-Questions/How-to-access-free-MS-Office-365-personal-1-year/td-p/6982546
Then
O365/Office when installed under a Win user admin account, and run from that admin account, auto logs in when the PC is started. There is no separate login for any component.
Win search for Word > Resulting shortcut > Rt click > Pin to task bar > start Word from that shortcut (hover mouse over the shortcut gives access to the 10 most recent docs)
Same for other core components.
Start eg Word open an old doc via recents/search
Rarely any need to access OneDrive itself.