1. First, turn on the phone and click "Meitu Xiu Xiu" on the home page of the phone.

2. Then click the "Portrait Beauty" option in the pop-up window to select the photo to retouch.

3. Then in the pop-up window, click "Face-lifting and Slimming" in the menu bar below.

4. Then click on the arm that needs slimming in the pop-up window and slide inward to achieve slimming effect.