HASS.Agent's integration isn't part of Home Assistant's core (yet), so you'll need to install it before you can use it.
The easiest way to do this is by installing HACS (Home Assistant Community Store). It's a central hub through which you can install tons of useful integrations, themes, custom cards and scripts. They've written a step-by-step guide on how to do this:
Or you can use one of the youtube guides, like this one: How to install HACS in 2022 in Home Assistant
You can also ask for help in the HA forums if you're stuck.
After you've installed HACS (and rebooted HA), you can use this link to jump to the integration (thanks @c00ldude1oo):
Or if you want to navigate yourself: open HACS by clicking on its icon on the toolbar on the leftside of HA. Then click
EXPLORE & DOWNLOAD REPOSITORIES (bottom right) and search for
Note: you ONLY need the
media_playerintegrations are legacy, you can ignore them.
Another option is to manually install the integration. The downside of this is that you'll also need to manually update every time.
Go to the integration's repository. Click on
Browse to the
custom_components folder, and extract the
hass_agent folder into your HA's
config\custom_components folder. Restart HA to load it.
It's highly recommened to have MQTT up and running. This way, you'll have all the latest features. If you don't already have it, follow this guide to help you get started.