My clicker isn't responding at all when I click.

First try resetting your clicker.  If that doesn't work then it may be that the batteries need to be changed.

To remove the batteries you will need a small Phillips head screwdriver.  The battery compartment is located on the bottom of the back of the clicker.

RF-LCD clickers take 2 CR2032 3V clickers like the one seen above.  These batteries are available at the bookstore, but they can also be found at Walmart or Amazon.com.