Go to your webinar page and click Manage Webinar. Under the recording, there is a Copy Embed Code button. Click the button for the recording code.
You can also scroll down past the recording near the bottom of the section. There you will find Embed Webinar Into Website with two buttons: Embed Recording Registration and Embed Recording.
The registration option will embed a widget that allows people to register for the recording. The other option button is the same as the Copy Embed Code button mentioned previously.