Click on the symbol which is common to both cards. You can click either on the top card or the bottom one. I recently added a record time, you can probably beat mine quite easily...
This was originally going to be a cloud project but I couldn't get it to work. If you know how to and would like to give it a try feel free to remix and sort it out, I left all the attempted code in the project including some code for testing. Though the code will probably be difficult to understand because it's a mess (:
