Office 365 (Outlook on the Web) - Create, Modify, or Delete a Meeting Request or Appointment
For the most current instructions, please reference the following Microsoft help article: https://support.office.com/en-us/article/create-modify-or-delete-a-meeting-request-or-appointment-in-outlook-on-the-web-6283f744-4ce1-470e-9d6b-96fa94e52996.