Brother’s wife keeps bugging me

My bro’s wife keeps bugging me about joining an international dating social for me to “explore” and “find a woman.” She and my brother got married recently after my bro went abroad to attend the event. I don’t really believe in that sort of crap which is why I’m getting annoyed at the fact that my sis-in-law keeps bugging me to Mitmachen one. What do I say to convince her to stop bugging me with this?