giving up?

Hand converted with online PokerStrategy.com hand converter:

ハンドをプレーする

$0.1/$0.25 No-Limit Hold'em (6 handed)

Known players:
[tg]BU (Hero)$33.61:///////;SB$21.10:///////;BB$26.78:///////;MP2$9.72:///////;MP3$27.41:///////;CO$42.51:///////;[/tg]

Preflop: Hero is BU with 6:c, 6:h.
3 folds, Hero raises to $0.62, SB folds, BB calls $0.37.

Flop: ($1.34) Q:c, J:h, K:d (2 players)
BB checks, Hero bets $0.80, BB calls $0.80.

Turn: ($2.94) 8:d (2 players)
BB checks, Hero checks.

River: ($2.94) 3:s (2 players)
BB checks, Hero checks.

Final Pot: $2.94.
Results follow:

Hero shows a pair of sixes(6:c 6:h).
BB shows high card ace(9:h A:c).

Hero wins with a pair of sixes(6:c 6:h).

he is unknown.
this should be flop check,and then fold?