You will first have to sign in with your Microsoft account (enter username and password), enter the product key (you can buy Office on many websites, please find the one that suits you best), enter your country and language preference and finally download and install your copy of Microsoft Office suite.
Microsoft Office suite can be activated on the official Microsoft website here: https://setup.office.com/?ms.officeurl=setup.
You will first have to sign in with your Microsoft account (enter username and password), enter the product key (you can buy Office on many websites, please find the one that suits you best), enter your country and language preference and finally download and install your copy of Microsoft Office suite.
Good luck,
Ugetfix team