On the main menu go to the options menu. Then click cheats and type the cheats in from there.

Password Effect

needshelp 50 extra skill points
GiveMeStuff All create-a-skater-items
LetsGoSkate All decks
OverTheTop All fun items
WatchThis All game movies
SweetStuff All lounge bling items
LAIDBACKLOUNGE All lounge themes
IMGONNABUILD All rigger pieces
LOTSOFTRICKS All specials available
Trippy All video editor effects
PutEmOnTop All video editor overlays
BeefedUp Full stats
NotADude Play as Mel
LooksSmelly Play as Rube
Movers Play as Shayne
Dapper Play as Spence
Shaker Play as TV Producer

On the main menu go to the options menu. Then from there there should be an option called cheats, click there. Then just type the chat in,

Password Effect

FOREVERNAILED 100% Branck Completion
TheIndoorPark Air and Space Mueseum Level
ThePrezPark FDR Level
TheMissing Invisible Skater
THELOCALPARK Lansdowne Level
TinyTater Miny Skater
MagicMan No Board
STILLAINTFALLIN Perfect Manual
AintFallin Perfect Rail
CRAZYBONEMAN Play as Boneman
MoreMilk Play as Bosco
NotACamera Play as Cam
TheCoop Play as Cooper
Sketchy Play as Eddie X
Piledriver Play as El Patinador
Flyaway Play as Eric
Rabbies Play as Mad Dog
INTERGALACTIC Play as MCA
Booyah Super Checking
Myopic Unlimited Focus
SUPERSLASHIN Unlimited Slash Grind

Unlockable Levels - Enter these codes in the options menu of the main menu.

Password Effect

THEINDOORPARK Unlock Air & Space Museum
THEPREZPARK Unlock FDR
THELOCALPARK Unlock Lansdowne