There are two ways to go forward when using bromine for sanitation, assuming a fresh fill.
#1: Establish a bromine bank by adding sodium bromide to the spa. Usually adding 50 ppm of sodium bromide is sufficient. Once you have this bromine bank, use either bleach, dichlor (your chlorinating sanitizer in the image) or monopersulfate (MPS, the Spa Oxidizer in your image) to convert some of that bromide bank into bromine, your active sanitizer. Periodically, especially after soaks and for routine maintenance, you need to add bleach or MPS to reactivate bromide to bromine as it is consumed by organics. That chlorinating sanitizer you have also adds CYA to the water, but that's irrelevant for bromine sanitation. Bleach is cheaper, but dichlor or MPS will do as well.
#2: Establish a bromine bank by adding sodium bromide to the spa. Same as above. Then you add a bromine tablet floater to the spa. You need to adjust the flow/opening of the floater to provide adequate dissolving of tablets to maintain bromine levels. You can still use any of the oxidizer products (bleach, MPS or dichlor) to shock the spa. That is, to quickly raise the bromine levels if needed. I'd recommend doing that weekly or after heavy usage, as per the sticky thread.