You have the Murray's figure, so Randal just needs to paint it in blue and red.
Go to pub and look at the chalk (on the pool table). Randal can't take it because of father Roy.
Try to take one of the pool cues. Go to Elaine and tell her that there is no white cue. She gives you cue ball, so put it on the table and take the pool cue. Aim the lamp (above the table). Take the chalk from the floor and use it with Murray's figure.
Go near the pawn shop. Talk with the worker named Bob. Use the figure with the paint and then with the fixative.
To get back the figure, use the fishing rod with the eucalyptus candy and then use this set with the hole in the manhole cover. Use the hammer with koala bear.
Take koala, Randal will take also a customized figure and the hammer.
Go to convention ad give the figure to Charlie. Randal gets the ring. Leave the place (by evacuation exit). Use the koala with the thief.
For ending the third chapter you'll unlock the achievement 'Day 4' (on the beginning of next chapter).