Draw (2R,3R)-2-bromo-3-phenylpentane in the conformation from which it is most likely to undergo E2 elimination to give 3-phenyl-2-pentene.
Follow this procedure:
Click on the appropriate conformer from the toolbar, and click in the MarvinSketch window. The C-C bond of the structure that appears should become the C(2)-C(3) bond of the pentane chain.
Press the appropriate atom button.
Click on an H atom to replace that H atom with the desired atom. Add extra atoms as needed to complete the molecule.
Do not delete any of the atoms or bonds in the template with the Erase button, and do not move atoms or groups by dragging them.