GTM helps marketers optimizers with a painful issue: implementing lots of different types of code on a site. Before GTM, putting new code on your site was a messy, risky business.
How to install Our.Guide's widget code through Google Tag Manager:
Step 1. Copy your widget code from Our.Guide' panel:

Step 2. Open Google Tag Manager panel:

Step 3. Click "New Tag":

Step 4. Click "Custom HTML code":

Step 5. Paste here Our.Guide's code & remember to check the option "document write":


Step 6. Choose option "For All Pages"
Step 7. Save and Publish
Now Our.Guide's widget is working on your website.