Looking at this hand I dont feel I played the river correctly, the bad thing about this is I have no idea why. Maybe just because I lost the pot.

PokerStars No-Limit Hold'em, $0.10 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($9.80)
Hero ($9.90)
BB ($17.45)
UTG ($10.90)
MP ($31.60)
CO ($1.80)

Preflop: Hero is SB with 4, K.
3 folds, Button calls $0.10, Hero completes, BB checks.

Flop: ($0.30) K, K, A (3 players)
Hero bets $0.2, BB folds, Button raises to $0.4, Hero raises to $1.4, Button calls $1.

Turn: ($3.10) 5 (2 players)
Hero checks, Button bets $0.6, Hero raises to $3, Button calls $2.40.

River: ($9.10) A (2 players)
Hero checks, Button bets $5.3 (All-In), Hero folds.

Final Pot: $3.80

Results in white below:
Button doesn't show.
Outcome: Button wins $14.40.