This is my Malphite Support Guide.Please follow my instructions and info in here.

Don't leave your ADC alone.You can roam to have advantage at other lanes.Remember, you're the one who will set if there's a clash with your Unstopabble Force(R) skill,it depends on you if your team will win that clash.Just focus and stay calm.Your the support,motivate your team.Don't be a toxic one.Also avoid trashtalking to build a team chemistry.

Just always hit the Melee and Siege Minions if the Relic Shield's Spoils of War passive is available.And don't forget to upgrade it to Targon's Brace.

I always have this Guardian Resolve Rune in my Support Champs b'coz it's effective in almost all of my support champs.So i highly recommend you this rune.

Well, for me i recommend my Spells Heal + Exhaust, but you can also have Flash + Exhaust.It's your choice which spells combination.