You can install TrenDemon by using Google Tag Manager. Log into your Tag Manager, click on the account name to which you want to add TrenDemon, and Create New Tag:
1) Sign in to your Google Tag Manager account and click "New Tag":
2) Insert the name of the tag and click on "Choose a tag type...":
3) Choose the type "Custome HTML":
4) Paste the code into the container:
5) Click on "Choose a trigger...":
6) Choose "All Pages":
7) Click "SAVE":
8) Submit the tag: