"I am here."
I don't know тут but this is what I learned from another discussion: здесь is a place "here" while вот is "here is"/"here are" when pointing something out. So "Я здесь." would be along the lines of "I am the place that is here" while "Я вот" would be "I am that place" with "that place" being where you are. Its mostly a grammatical difference.
It says I have an error but I spelt it the same way as they did? https://dl.dropboxusercontent.com/u/27205658/Screenshot%202015-11-03%2006.51.10.png