To solved a friends bad day is like this:
A.Ask your friends hobi and ask your friend to play.
B.Help them when they has a problem and help them solved it.
C.Cheer them up by voting them.
D.When they has a problem tell them what do you feel,say and do when you has a same problem
E. Make them happy by helping them in difficulty times.
F.Say "Sorry" when you make the problem.
G.Help and Care and LOVE is the way to make friends happy.