Check again the article to use Touchpix designer and make sure to follow all the steps as indicated.
Try these steps:
Open your Touchpix app.
Tap on the upper left icon and note down the event number.
Go to your account's event page.
Find the previous event code listed there.
Tap the 'overlays' icon for that specific event.
Your overlays should show on the screen.
Verify that the preview images match the design you added to the event. If the preview image is correct, please, refresh your event in the Touchpix app to update your event settings.
A few things have to be taken into account when checking if an overlay is correctly added:
Check under 'overlays' in your desired event that your overlay is added to the function you want to use for recording
Refresh the event in your app. Check under 'video' or 'photo' overlays if it's added
Photo overlays must contain Photo Templates, which indicate where the picture will be placed and in what order (1, 2, 3...)