hi.
am i allowed to manually close positions in the social trading contest?
Even though Social Trading Contest rules don't explicitly forbid manual trading (opening, closing, managing positions), such practice is not recommended and you might get penalized for that.
You can unsubscribe from a provider but keep in mind that that would close all the trades that were opened based on his signals.
More information:
https://www.dukascopy.com/fxcomm/social_trading/?action=rules
https://www.dukascopy.com/fxcomm/?page=News§ion=14