To use a container registry with MicroK8s, you can follow these steps:

1. Enable the `registry` add-on in MicroK8s by running the following command:
```bash
microk8s enable registry
```

This command will start a local container registry in your MicroK8s cluster.

2. Verify that the `registry` add-on is running by checking the status:
```bash
microk8s status | grep registry
```

The output should show `enabled` next to the `registry` add-on.

3. Push an image to the local container registry. First, tag an existing Docker image with the address of the local registry. For example:
```bash
docker tag my-image:latest localhost:32000/my-image:latest
```

Replace `my-image` with the name of your image. The address `localhost:32000` corresponds to the default address of the local registry in MicroK8s.

4. Push the tagged image to the local container registry:
```bash
docker push localhost:32000/my-image:latest
```

This will push the image to the local registry within MicroK8s.

5. Use the image from the local registry in your Kubernetes manifests or deployments. Update your YAML files to reference the image from the local registry. For example:
```yaml
apiVersion: v1
kind: Pod
metadata:
name: my-pod
spec:
containers:
- name: my-container
image: localhost:32000/my-image:latest
```

Replace `my-image` with the name of your image, and `localhost:32000` with the address of the local registry.

MicroK8s will now use the local container registry for pulling images within your cluster.

Please note that the local container registry in MicroK8s uses port `32000` by default. If you encounter any issues or conflicts with this port, you can customize the port by modifying the `registry` add-on configuration.

By following these steps, you can enable and use a local container registry with MicroK8s to push and pull container images within your cluster.