Depending on the settings decided by the instructor, round two could either be a repeat of round one or a continuation of the work made in round one and has several additional decisions to complete. Please contact your instructor to learn which version you are using in the course.
You may want to review your results from Round 1 while in round 2. There are several ways to get to this information- the Results Summary page (see image below) or by going to the ad and/or email campaigns to drill in to more specifics on what you ran in the first round.
Please make sure to take note of what worked and what didn't work in round 1 so that you will be best equipped to make effective changes for round 2 and improve your results.