1. Open the background image of the signature file.

2. Thumbnail (Meitu Xiu Xiu Web Edition does not have this function).

Click the matting pen to "change the picture", and then click "Finish matting". Be sure to point out "Save the foreground as the material" (it can be found in jewelry and customized by users).

3. Processing (adding fonts, decorations, etc.)

accomplish

Maybe I'm not sure. You can use mine.