Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
If your computer has a preinstalled office trial, you need to uninstall that before trying to install the software from the card key. then go to office,com/setup and follow the prompts. you have to scratch off the blue strip at the bottom of the back of the card to reveal the key number that is 25 characters long. good luck