#1 Set up the balanced chemical equation:
CuSO4(aq) + 2 KOH(aq) = Cu(OH)2(s)+K2SO4(aq)
#2 Based on the equation above you may put down the total ionic equation:
Cu2+(aq) + SO42-(aq) + 2K+(aq) + 2OH-(aq) = Cu(OH)2(s) + 2K+(aq) + SO42-(aq)
#3 After the cancellation of the spectator ions K+, SO42- you'll get the following net ionic equation:
Cu2+ (aq) + 2OH-(aq) = Cu(OH)2(s)