No ads and any other needless changes in the WordPress. This plugin is primary created for my own websites - make money is not the reason why I created it.
Just use standard Plugin overview page in WordPress admin section and deactivate it or rename plugin folder /wp-content/plugins/secure-admin-ip over FTP access.
It's up to you! You can use new line, dash, comma, ...
Just create new file (JSON format) and host it on public URL. Example: [{"ip":"1.1.1.1","description":"Michal"},{"ip":"2.2.2.2","description":"Novak"}]. Cache is used so don't need to afraid about a lot of requests on that file (server load).
Save settings fail if your current IP address will not be found on new whitelist.