i remember having problem with that too when i was using the desktop version , i put it in like this :
Metatrader 4 terminal path:
C:\Users\Timmy\AppData\Roaming\MetaQuotes\Terminal\
Metatrader 4 data path
C:\Users\Timmy\AppData\Roaming\MetaQuotes\Terminal\30D279B64B1858168C932D8264853F2B\MQL4\
and that works for me