DNA testing begins today for more than 400 children taken from a polygamous sect in Eldorado, TX.

The video provides instructions on how to navigate to the rear of a building.

What is the instruction given regarding the location in the building?

Where should one go according to the text?

What part of the building is mentioned in the instruction?

What action is suggested in the text?

What is the significance of the rear of the building in this context?