You can get started with web push notifications in less than 5 minutes using Google Tag Manager. Here is how you can do it:

1. Sign in to your Google Tag Manager account and click on 'New Tag'.

2. Start by giving your tag an appropriate name. For instance - iZooto Tag

3. Select the 'Custom HTML Tag' option.

4. From your iZooto Panel, copy the iZooto JS and place it under and Select the Trigger.

5. In order to get it working you need to save and publish your Tag.