So if you type out
Mesh1P->SetRelativeLocation = FVector(-.05f, -4.4f, -155.7f);
You will get an error about something with the ‘=’ sign
So how you fix this is simply changing it to
Mesh1P->SetRelativeLocation(FVector(-.05f, -4.4f, -155.7f));
Because it is a function call you can not set it equal to anything