It is possible to install Picreel code by using Google Tag Manager.
Please, follow these steps:
1.Navigate to Container in the top menu of your Google Tag Manager account.
2.Click Tags in the left menu to the left.
3.Choose to add a new Tag.
4. Select Custom HTML Tag.
5.Paste Picreel snippet code in the configure tag window.
6.Choose where to trigger the code, like All Pages, or Some Pages.
7.When you're done, don't forget to click Publish in the top right corner of your account.