The config.json file can live in a number of places. In my configuration it is at the top of the .wiki folder:
.wiki/config.json
This file contains all the configuration you need for your local-first wiki.
{ "id": "/home/…/.wiki/status/owner.json", "security_type": "friends" }
NB. The quotes used in the config file must be double quotes. Replace ‘…’ with your user name.
As long as you have:
"admin": "…",
in your config.json file – you should have admin user rights. The admin parameter depends on the selected security type. In the case of a local wiki, we assume security_type: “wiki-security-friends”. Replace '…' with the secret from your owner.json file.
See owner.json
Make sure you are logged in, and that you restart your wiki server after making any changes to your configuration.