To get started using Google Tag Manager, first you have to get your Google Tag Manager Container ID, then follow these steps to enter the code into your website:

1. Click Settings or the Gear icon on the left menu.

2. Click the Website & Branding tab.

3. Click the Google Analytics link in the Settings section.

4. On the Manage Google Analytics Settings page, enter the Google Tag Manager Container ID in the Container ID field.

5. Click the Save button.

   
   

This will connect your website to the Google Tag Manager. To add more tags using Google Tag Manager, use the steps in the Add tags, Verify that your tags work, and Publish tags sections from the Google Tag Manager guide.