Touch Detective 2-1/2

Hope someone can help with this game. :-[ :-[ I'm new to ds gaming and thought this would be a simple game to play but .. I can't even get out of the tutorial! Have found a pea, a dropper and an atomizer but how do I get out of the room? Thanks in advance to anyone who can help :)

you have to join them together.
oh and feed the pea to that THING sleeping in the bath.
hope it helps. played this game a long time ago so yea...