Can’t find AddOn

[Martius108]

I’m sorry to ask stupid questions here, but I can’t find your AddOn/repository.
I don’t see this path in my installation:
Within Home Assistant, click Supervisor-> Add-on Store -> … button (in top left)-> Repositories. Add this repository.
There is no Supervisor nor a Repository button in the top left ..
I have HACS installed but there is no AddOn with this name either. I work with a Pi4 and have the latest HA Software installed.

Thanks for your help.

[e3e6]

Settings - Add-ons - Blue button "add add-on store"