First off, welcome to the Citadel, nightmareshadow!
If by blue boxes you mean the summary then I see you have it covered. As to freetext, it's fairly simple really. You type in whatever you want (e.g. the name of your world, the type of weapon, the kind of landscape, etc.) and then, once your sub is published anyone can search the freetexts for, let's say, Silly. Then they would see all of the subs with the Silly freetext, including yours if you added that freetext.
P.S. I don't know whether you care, but proper grammer has the first person singular pronoun 'I' capitalized.