Hello Emer,
Good day!
Thank you for posting in Microsoft Community. We are happy to help!
Per your description, you need to edit a meeting series set up by your channel owner. Firstly, please note that only the meeting organizer can make changes/edit a scheduled meeting.
On the organizer’s calendar, select/click on your series meeting in Teams Calendar, select Edit. You will then get two options:
- Edit Occurrence – All changes will apply that meeting occurrence that has been selected.
- Edit Series – All changes will apply to all the meeting series.

To change a recurring appointment, meeting, from outlook,
When you open a recurring appointment, meeting, or event, Outlook will ask you if you want to open just this one event or the entire series of events.

If you'd like to edit a single instance of a recurring item, select Just this one. Otherwise, select The entire series. You can make changes to the appointment, event, or meeting details, recurrence patterns, and attendees. When you're done, select Save & Close for appointments and events or Send Update for meetings.
Note: You can't change the details for meetings or events other people have invited you to.
For more info, please see Change an appointment, meeting, or event (microsoft.com)
Hope this helps. Please let me know if there are any misunderstandings or concerns.
Best Regards,
Ashraf | Microsoft Community Moderator