As far as I know, the Business Standard plan for Teams does not allow you to edit the content of reminder emails or change the timing of when they are sent. However, you can send custom emails to attendees by using the "Send email to attendees" feature. To access this feature, go to the webinar details page and click on "Send email to attendees" under the "Attendees" tab.
If you want to change the timing of the reminder emails, you can try creating a new event with a different start time and see if that changes the timing of the reminder emails. Alternatively, you can consider upgrading to a higher plan that may offer more customization options.
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