I think I may have slow played it too much on the Flop and maybe played too aggressive on the River. I didn't want to scare the short stack away so I let him lead the betting. I think the River bet was a bit excessive. I thought the guy would think I was trying to scare him away and call me.

Can anyone help me on this hand?

Table Fish - n - Chips (Real Money) -- Seat 3 is the button
Total number of players : 9
Seat 1: platoing ( $37.53)
Seat 2: avogadno ( $38.81)
Seat 3: Gambolputty ( $20.5)
Seat 5: doyllangwel ( $28.24)
Seat 6: Cant_Be_True ( $47.15)
Seat 7: JaKKeLL ( $22)
Seat 8: colefx2000 ( $34.85)
Seat 9: onthescene ( $5)
Seat 10: Coldmultra ( $21.47)
doyllangwel posts small blind (0.25)
Cant_Be_True posts big blind (0.5)
** Dealing down cards **
Dealt to Coldmultra [ 9h, 9d ]
JaKKeLL folds.
colefx2000 folds.
onthescene raises (1) to 1
Coldmultra calls (1)
platoing calls (1)
Gambolputty folds.
doyllangwel calls (0.75)
Cant_Be_True folds.
** Dealing Flop ** : [ 9c, Kc, Kd ]
doyllangwel checks.
onthescene bets (1)
Coldmultra calls (1)
platoing calls (1)
doyllangwel calls (1)
** Dealing Turn ** : [ 6s ]
doyllangwel checks.
onthescene bets (3)
onthescene is all-In.
Coldmultra calls (3)
platoing folds.
doyllangwel calls (3)
Creating Main Pot with $16.65 with onthescene
** Dealing River ** : [ Qh ]
doyllangwel checks.
Coldmultra bets (10)
doyllangwel folds.
** Summary **
Main Pot: $16.65 | Side Pot 1: $10 | Rake: $0.85
Board: [ 9c Kc Kd 6s Qh ]
platoing balance $35.53, lost $2 (folded)
avogadno balance $38.81, sits out
Gambolputty balance $20.5, didn't bet (folded)
babyspades balance $15, sits out
doyllangwel balance $23.24, lost $5 (folded)
Cant_Be_True balance $46.65, lost $0.5 (folded)
JaKKeLL balance $22, didn't bet (folded)
colefx2000 balance $34.85, didn't bet (folded)
onthescene balance $16.65, bet $5, collected $16.65, net +$11.65 [ Qd Qc ] [ a full house, Queens full of kings -- Kc,Kd,Qd,Qc,Qh ]
Coldmultra balance $16.47, bet $15, collected $10, lost -$5 [ 9h 9d ] [ a full house, Nines full of kings -- Kc,Kd,9h,9d,9c ]