A coworker who is teaching Popfly to his daughter just asked me,

I'm working with my daughter who is working on a game and she wants to import a picture to be an actor.

How does she do that? And is there a wiki or other site to get these kinds of answers?

For once in my life, I have answers to both.

If you look in the upper right (next to your name) you’ll see the integrated help. That will open the Help window.
From there, you’ll get context-sensitive help. If a topic isn’t covered in the sidebar, you can click on the more help section on “How Do I…?” which will take you to the online documentation on http://www.popflywiki.com.
The page you’re looking for is linked to from several places – it’s called “How do I use uploaded files in my game?” and it’s here http://popflywiki.com/GameCreatorUsingUploadedFiles.ashx.
Once there, you’ll need to read the instructions, but they go like this. First, create a game (you’ve done this) and save it. Then upload the image. Go to the Game tab and on the right you’ll see the “Files” section. Click to add a file to your project, either from the web (e.g. from Flickr) or from your computer. Once it’s uploaded, save the project again.  I’m uploading john.PNG.
Now click on the Scenes tab and click on Draw. Then click on “Switch to XAML.” The screen should look roughly like the one on the right.
Next, add the XAML to include the file between the two <canvas> tags. In my case, I’ll add john.PNG. <Image Source="$base$/john.png" Canvas.Left="191" Canvas.Top="324" Width="200" Height="150"/> The Canvas.Left, Canvas.Top, Width, and Height control where the image will go and how large it will be. You’ll have to experiment to get it to the right position.
Save the game and run it. My “game” looks like this. I’ve saved it as http://www.popfly.com/users/johnmont/wonk.details, but we have examples in our tutorials of how to do this as well – the Canada Quiz in particular.