Two important things in your question injac...
Yep, the right side of the BIABacus is what you should have bought/added to your brew. Same with the hops. The left side tells you the 'blend' or ratios.
The VAW tells you how much wort the original brewer made (you've typed 18.7 but in the post Rick linked, it should be 18.27 L).
The blend and VAW used are the two pieces of critical information needed to copy a recipe with any sort of success but this info is usually very hard to find in most recipes external to this site. Luckily, You do have the above info from the original recipe (the blends/weights/amounts/ratios and 18.27 L of VAW). Once you have typed in the grain blend (easy in this case as it is 100% Maris Otter or just type 3000) and the hop blend on the left of Sections C and D and the VAW at the top of Section D, the recipe has integrity and the BIABacus will allow you to alter it in a couple of seconds to suit your equipment and available hops.
For example, in the files I have looked at above, you have, in Section B, a Desired VIF of 15 L. If someone else has a bigger sistem than you do, all they have to do is type in their desired VIF and everything will change on the right.
Make sense?
....
One other issue that you need to be aware of is that the hops you will use in your brew will rarely be of the same AA% as those the original brewer used. So, make sure you type in the AA% of the hops you buy or have into the right hand side of Section D.
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