Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Which specific subscription product did you order? If you have Microsoft 365 Personal, 365 Family, or 365 Premium, you install Office on your PC from your account at https://account.microsoft.com/services.
If you purchased directly from Microsoft, the association between your product and your account would have been created as part of the purchase. Purchasing from a third-party seller may require that you enter a product key at https://setup.office.com (you will be prompted to sign in as part of the process).
To install your product on a PC, make sure that you sign in with the account which is associated with your subscription. After the install has completed, find and start the individual apps via the Start menu.