Final answer:
To modify the instructions on the 365 login page, you should modify the Azure AD Company Branding Template that allows customization of text, images, and layout to align with company branding guidelines.
Step-by-step explanation:
To modify the instructions on the 365 login page, the correct template to modify is the Azure AD Company Branding Template. Azure Active Directory is responsible for the login process of Office 365, and by accessing the Azure portal, you can find options to customize the branding of your organization's sign-in page. This includes modifying text, adding images, and making layout changes to align with your company branding guidelines. Customizing this template will change the appearance of the 365 login page for all users in your organization.