Well, you need to change "pathto" to whatever the path to the files actually is, e.g., I have

ConfigDir "$ThemeDir$config"

and then

RainmeterSkinPath "$ConfigDir$Rainmeter\\\"
RainmeterIniFile "$ConfigDir$Rainmeter\rainmeter.ini"

The "pathto" was used as an example, not to be taken literally. =)