[Office stage]
Go to where you placed the creature earlier and watch its size. Pick the creature up and shake it a little. Drop it in the center of the lab. Watch it move around (you might have to move it a little since it can get stuck) then it teleporrts away.

i return from office,and i go to check the creature but i can't open for pick up,how can i do???

Make sure you wait until Monica is completely asleep in the office then you will get the queue to return to the lab and be able to progress