"Notifications offer a quick and easy way for the website to send message to its members about various events, such as Duel Challenges and Experience Point Level-ups."
Notifications offer a quick and easy way for the website to send message(s) (or send (a) message) to its members about various events, such as Duel Challenges and Experience Point Level-ups.
it may be grammatically correct. however, i think the suggestions i have in parenthesis might work.
nate
