How to Use Conditional Logic
Login and go to your Admin dashboard (click here to learn how to do that). Click on forms and either select 'New Form' or 'Add New'. Give the form a name (this can be updated anytime).
One example of how you can use Conditional Logic is determining how many students a parent is enrolling.
In the title bar of the field, there is a button that looks like two sheets of paper. That's the Duplicate Field button. Click that button twice to add two more Student Name fields, as there is the option to enroll up to three children. Since the first Student Name field doesn't need any Conditional Logic, close that field and open the second Student Name field.
Once Conditional Logic is Enabled, several drop downs will show up. For this example, leave Show as it is and change All to Any. Then you're going to focus on the Rules, which are the three drop downs below. The first is drop down is the name of the Field, which for this example doesn't need to be changed. The second rarely, if ever, needs to be changed so don't worry about that. The third drop down is the Choices. For this example, change 1 to 2.
Then you're going to click on the little plus sign beside the last drop down so another Rule will be added. Again, the first two drop downs don't need to be changed, only the third. Change 1 to 3, as this field needs to show up if either 2 or 3 are selected.
That's how you use Conditional Logic!