From http://popupchinese.com/lessons/absolute-beginners/where-is-the-washroom, here's some great insight as to how to study the specifics on Popup Chinese:

"For those of you who are new to Popup Chinese, we encourage you to approach our lessons as bite-sized units you can learn at the pace of one a day: listen to our podcast first and see if you can understand our simple dialogue. When you're done, fire up The Fix to test your memory and speaking skills. Pay special attention to the tones. And in a day or two, review the materials with our customizable PDFs and transcripts. And let us know if you have any questions - we're always here to answer them."