Depending on your installation/setup that file is either in
"\Users\<UserName>\AppData\Local\Autodesk\3dsMax\<ReleaseNumber> - 64bit\ENU\<language>\plugcfg" (if useUserProfiles=1 in InstallSettings.ini, the default)
or in
"<max_directory>\<language>\plugcfg" (if useUserProfiles=0 in InstallSettings.ini)
By "submit renders to our render nodes" you mean submission to backburner? If so, then check which user runs the backburner server and search for the file in the corresponding user profile.
Good Luck