Can I edit an email campaign after scheduling it?

Yes, you can edit a scheduled campaign created in Zoho Campaigns. All you need to do is:

From the Navigation toolbar, click Campaigns, and then Email Campaigns.
From the campaign list view, click the scheduled campaign you want to edit.
The campaign configuration page will open, and you can make the required edits.

Note:

If you make changes to a scheduled email campaign, it will go through the review process again.