I've not tried this particular recipe but the general process is to start off with around 70-75% of the water heated to 50-55 degC. Mix the chemicals into the water in the same order as listed in the article (the order is sometimes important for everything to dissolve easily). Each chemical should be completely dissolved before adding the next. Top up with water to make a total of 1 litre.
Have fun, Bob.
[Just noticed - you have no amount given for the water for solution B.]
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