Basically, its a progressive schedule, that makes you increase weight each week, with a deload every 6th week(revert weight to previous week) to let recovery catch up.
First, in the top brackets, you fill in the biggest weight for how many reps (between 2 and 8) you can do. The excell calculates then your 5rep max, and the entire sheet.
You will notice, that the 4th week, you will do your calculated 5 rep max. the previous 3 weeks, you'll be doing less, to acclimatise to the schema, and to not hit the roof to early.
you will do 5 sets on monday, the fifth set is the most important one, the previous 4 are based on it like :
50% of 5th set
62.5% of 5th set
75% of 5th set
87.5% of 5th set
5th set
and that 5th set like i said, depended on the 5rm you calculated above.
Now on fryday, its diffrent, the first 4 sets are exactly the same. the 5th however, lets you increase the weight by 2.5%, but only for 3 reps. your theoretic 1rep max will be lower, but you will feel the new weight. added is a 6th set, that is the same as the third in weight, but for 8 reps. this is good for pump and microtrauma
if you succeeded to do 5 reps of the 5th set on monday, AND 3 reps of the 5th set on fryday, then your weights will increase by 2.5% for the next week.
Like this you will improve each week by 2.5% untill the 6th week, where you'll deload.
week 7-12 is where you will make most of the progress.
oh, and wednesday is actually easy, if you get 5 reps of the 4th set, next week weight +2.5%.
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Dule i would strongly recommand if you arent sure about form, to work on that for a while. this schedule will improve you so much, but the 5-3 rep is critical for strenght + muscle gains.