Creating a diary app - or using Structs and Arrays and Storage

Is this forum entry still relevant?

It suggests I can just instantiate an Array item child by merely using it in context (am I right?)…like this…

Do = Variable(myStruct[VariableString(count_1)][VariableString(count_2)].childVar) To Variable myVar

But I don’t know how to get to do a “Do”?