Hello and welcome to the community !
I’m not quite sure why you declared your variables before assigning them.
You should declare your variables by using snake cases with the first letter of each new word besides for your first one capitalized, instead of capitalizing each letter after your first word.
Hello and welcome to FCC Forum, a community of people helping each other! @starstruck has provided good guidance. It is important to use the same style due to case sensitivity for programming.
You will learn about camelCase style in a future lesson, which is what the myFirstName and myLastName appear to be to me.
I think resetting the lesson, and following @starstruck guidance, should allow you to pass to the next step in your coding journey.