This summary is not the rule. The rule text controls.
If you want a jury to decide your case instead of a judge, you have to ask for it the right way and on time. You can make this request in one of two ways: you can put the demand right in one of your court papers (like your complaint or answer), or you can file a separate written request with the court clerk and let the other parties know about it.
Timing matters a lot here. You only have 15 days after the last paper is filed that raises a factual dispute in the case. If you miss this deadline, you may lose your right to have a jury hear your case, even if you would have qualified for one otherwise.
This rule applies to any issue in the case that the law says can be decided by a jury. So if you think a jury should weigh in on any part of your dispute, act quickly. Talk to your attorney early about whether you want a jury trial, so you don't accidentally miss the deadline to ask for one.
