How do I use InstancedStaticMeshes?

Hi all,
I’m triyng to follow the examples but I’m stuck with this variable I can’t find anywhere.

if (!StaticMeshComponent) return;

 //Mobility
 StaticMeshComponent->SetMobility(EComponentMobility::Movable);
 
 //Collision
 StaticMeshComponent->BodyInstance.SetCollisionEnabled(ECollisionEnabled::QueryOnly);
 StaticMeshComponent->BodyInstance.SetObjectType(ECC_WorldDynamic);
 StaticMeshComponent->BodyInstance.SetResponseToAllChannels(ECR_Ignore);
 StaticMeshComponent->BodyInstance.SetResponseToChannel(ECC_WorldStatic, ECR_Block);
 StaticMeshComponent->BodyInstance.SetResponseToChannel(ECC_WorldDynamic, ECR_Block);

could someone help me?

thx

Davide