Helm must be installed to use the charts. Please refer to Helm's documentation to get started.
Once Helm is set up properly, add the repo as follows:
helm repo add horizon https://horizoncd.github.io/helm-charts
You can then run helm search repo horizon
to see the charts.
The source code of all Horizon community Helm charts can be found on Github: https://github.com/horizoncd/helm-charts/