Definitely do some reading up on clicker training then. If you don't know what you are doing then it won't work properly.
The first thing you need to do is "charge" the clicker up so the dog understands the clicker(marker) means treats. So stand in front of Ruby and just click then give her a treat, repeat that 20 times and she should understand that click means treat.
Anyways, read up on proper clicker training otherwise you won't get the results that you want.