"ModifyEvaluatorNames" is a front end token that opens a dialog box for adding, removing, and editing kernel names.
This token is equivalent to the menu command Kernel Kernel Configuration Options.
The kernel names that you define here are shown throughout the front end whenever you have a choice of kernels. See Kernel Configuration Options... for more information.
To execute a front end token, you typically evaluate a command of the form FrontEndExecute[FrontEndToken[token]].