Here is how to set up a webinar in MS Teams:

How to set up a webinar in MS Teams or How to schedule a webinar in Microsoft Teams

More detailed instructions: How to use Microsoft Teams Webinars

Here is how you record and transcribe, and publish a webinar:

Manage webinar recordings in Microsoft Teams - Microsoft Support

1. Create and record a Webinar as described in the above instruction videos.
2. Make sure you set up the recording and transcription features when the webinar starts if you wish to record the webinar.
3. When you publish a Recording, you will see the link to the recording, and you can share it with participants.
4. Generally, all recordings that you initiated, or have been shared with you, can be found in Stream. Stream is an app in your Office 365

How to get to Stream:

1. Go to https://office.com and login with your COSTI account.
2. Click on the apps icon (1) (white dots), then click on Stream (2). If you don't see it, write "Stream" in the search field.

This will open Stream and you will see all recordings you initiated or have been shared with you.