Open TikTok and tap the plus (+) button to create a new post
Tap the “Duet” option on a video you want to duet with (or open the video, then tap “Share” and select “Duet”)
Choose how you want to duet (camera on/off, front/back camera, filters/effects if available)
Record your duet video while the original plays alongside you
Review the duet draft
Add caption, hashtags, and any settings you want (who can view, duet stitch options, etc.)
Tap Post