We don't have a specific section for scholarships essays, but if you follow the lessons for what makes for a good admissions essay, you will be able to write strong scholarship application essays as well since they're usually very similar to admissions essays (e.g. they will ask about leadership, or uniqueness, or a proud accomplishment).
We do have advice on a FEW specific scholarship essays at schools (ie, for the fellowships that Stanford GSB offers). In these cases, you will find the advice right alongside the advice for the rest of a program's essay questions (which all starts in the Writing Module).
If you find yourself REALLY stuck on an essay question, you can always drop us a note at email@example.com and we'll give you some pointers.
One final note...
Please realize that scholarships to business school are FAR less common than they were in Undergrad. Yes, they are available (and Lab users get them!) but most schools expect the majority of their students to pay for the degree themselves, via a combination of savings / student loans.
If getting a scholarship is the only way you can possibly go to school, then to be honest you need to cast a really wide net and apply to schools where your GMAT score is, let's say 100+ points over their average. That will help move the needle and makes it more likely that they'll want to grab you, so that your GMAT score helps improve their average.