Here is a hypothetical condition and question:

Let's say I created a list called "Toys." Then I make a simple form up
with a few fields in it. (field names not important for this example).

Now I create 3 folders in this new list, one called "Trains,"
another "Cars," yet another "planes,"

In PLANES, I click on NEW, and enter information into the form, then
hit OK.

Then, I just realised the entery I made was not for PLANES, but for
CARS.

How do I move that entery in the PLANES folder to the CARS folder?