[Closed] Kk 0.1/0.2

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.1/$0.2 Fixed-Limit Hold'em (9 handed)

Preflop: Hero is BB with K:s, K:d.
2 folds, MP3 raises, CO calls, BU folds, SB calls, Hero 3-Bets, MP3 calls, CO calls, SB calls.

Flop: (12 SB) J:h, 3:s, 7:h (6 players)
SB checks, Hero bets, MP3 raises, CO calls, SB folds, Hero 3-Bets, MP3 caps, CO calls, Hero calls.

Turn: (12 BB) 6:c (5 players)
Hero checks, MP3 bets, CO calls, Hero calls.

River: (15 BB) Q:c (5 players)
Hero checks, MP3 bets, CO raises, Hero calls, MP3 3-Bets, CO caps, Hero folds, MP3 calls.

Final Pot: 25 BB.

Results follow:

MP3 shows three of a kind, sevens(7c 7d).
CO shows two pairs, queens and jacks(Js Qd).

MP3 wins with three of a kind, sevens(7c 7d).

I'm confused about my play on the river...