How would you enter a rumble seat in 1931 Model T Ford?

A 1931 Model T Ford didn't have a rumble seat. Rumble seats were a feature that became popular in the late 1920s and early 1930s, but on other makes and models, not the Model T. The Model T's production ended in 1927. So there's no way to enter a rumble seat in a 1931 Model T because it wouldn't have one.