1S-Bitrix widget installation
1. Go to the Site Templates tab
You should switch to the "Administration" panel and follow the path: Settings -> Product Settings -> Sites -> Site Templates.
2. open the template settings tab
Open the settings tab of the desired template and click "Edit".

*If you know your template, you can see it: Settings - Product settings - Sites - List of sites, at the site select "Change", at the bottom will be a list of used templates.
3. edit the template
In the edit box, paste the widget code before the </body> tag, click "Save".