To install Picreel on 3dcart, follow these steps:
1. In your 3dcart open Settings. It's in the left menu.
2. Choose Themes & Styles.
3. Click on More and select Edit Template in the dropdown box.
4. You'll see a list of your pages. Click on settings and choose to edit. Do this for every page where you want to run Picreel.
5. Scroll down the code until you see the very last /body tag. Paste Picreel code just above it.
Don't forget to save your changes.