Didnt work - where do I get refund?!?

Downloaded this app before presentation when I found out the av guys forgot to get me a remote...
"No prob "- I say - "I can use my iPhone!!"

After 40 mons of fiddling, downloading and entering "not recognized" ip addresses, I ended up hiring a kid to flip the slides on PowerPoint for me.

Brutal.

Where do I take this thing back? I want my $10.

R103 about i-Clickr Remote for PowerPoint