Hi,
first you have to activate Format --> View --> Textures
Then AFAIK the picture must be defined as a FaceStyle:
- Format --> style -> Face Styles
- select New
- choose a Name and use one of the available as base
- choose Texture or Bump (press Help for an explanation)
- select Browse and navigate to your picture
OK
close
Now --> PartPainter --> Select the new Style just created and
select the element type to apply to from the pulldown
dy