in access vba how to say if a button is clicked then do something?

hi everyone I am working on a database to monitor all the data in our company I don't want to use msgbox in access so I made a self-made form, that the argument of the form will change based on the circumstances, the form has two buttons, and every time I want to ask a question from the user I simply call the form and change the button captions and the warning caption and etc. but in any circumstances, the button's action is not the same as the last action. so when I opened the form how should I program it: if the button is clicked then do an action? thank you so much