To hardcode custom server settings into your executables you must [build](/docs/en/dev/build/) the client yourself on your machine or [with GitHub Actions](/docs/en/dev/build/all/).
You can set the following environment variables on your OS and rustdesk will use those variables when compiling your client rather than the default rustdesk.com servers.
If you do not know how to set an environment variable on your system you should be able to find documentation for your OS online that will explain this.