In the Twitter for iOS and Android apps, you can change the title, thumbnail image, and set a custom starting point after ending a broadcast. To get started, tap on the broadcast you’d like to edit. Tap on the overflow menu, then tap the Edit Broadcast option. Once you make your changes you’ll be prompted to save.
Keep in mind that broadcast titles can be edited up to three times. Additionally, it will take up to 15 minutes for edits to appear in Twitter.