how do i add a note/ memo object?

Question

hey guys,
 
im working on a small project that acts as a personal gym assistant as im also into lifting weights/ gym.
 
i have a small program with 1 forms (windows application) i have a database for this too to keep track of the different weight, reps, sets and progress and a selection of combo boxes to choose which exercise im doing ... nothing fancy or complex, just a simple app.
 
question is though i now want to add in something that i can type a note into and for this to be saved to the database as well .... i was thinking i could add in a label called "add note" then when i use the click event on that label it would open up a message box .. but i know i cannot write to a message box so what can i use instead? would it be another form ?
 
been tryign to figure out for a while but im stuck.
 
 
thanks