Question

Add quotations in the dialogue.
I cannot see the board, Mrs Smith! Henry shouted

Answer 1

“I cannot see the board, Mrs Smith!” Henry shouted.
The quotations encompass strictly the dialogue and nothing else. So unless Henry stated that he was the one who said it, you would leave it outside the quotation marks.

Hope this helps!!

Answer 2

"I cannot see the board, Mrs Smith!" Henry shouted.