This video shows how to properly solder the 5 FSI connectors onto the Inner Rim Tag System (IRTS) Super Signal PCB. Once you get the solder paste properly applied to the PCB, press the FSI into position using the alignment pegs (the holes for the pegs are with the FSI silk screen footprint), and grab your hot air work station! Take your time and it should turn out great! Make sure you don't spend too much time with the heat gun in one position. You don't want to melt the plastic on the FSI.
Here is the rework station I used. www.amazon.com/dp/B08BK3M6YW?ref_=ppx_hzod_title_dt_b_fed_asin_title_0_0