Do not know what your intentions are with this. Still if you want to send them this message, a simple way is to search for them on Google and hen contact them with contact use adress provided there. I did some research and found this link for contacting the company that owns LastPass Authenticator :
https://www.logmeininc.com/contact-usLet us know if that worked for you so that other members use that option if they need in future.