How do I add the layout card?

Some days I feel like a total newbie.
And, yes I did look at the older posts like this.

I wanted to try using the Layout-Card, but when I try to add the layout card to a view, this is what I get:

 Custom element doesn't exist: layout-card.
 type: custom:layout-card

I’ve never used HACS before, but this is what I did:
Starting in HACS → FrontEnd.
Click on Explore and Download Repositories
In the search box, I put layout-card, and there it is.
I click on it and then click on “Download this repository with HACS”
Then “Download”
In Configuration → Dashboards → Resources
From here: “Add Resource”
You are using Lovelace in YAML mode, therefore you cannot manage your resources through the UI. Manage them in configuration.yaml.

No, I’ve been managing my dashboard with the UI editor for a few months. I would rather not go back to editing yaml code again.

So, what step did I miss?