No, it is not possible to add or remove a proton from an element to create another element by using a microwave. The number of protons in an atomic nucleus determines the identity of the element. Adding or removing a proton would change the atomic number and, consequently, the element itself.
Microwaves are a form of electromagnetic radiation that primarily interacts with the rotational and vibrational modes of molecules, causing them to heat up. They do not have the ability to manipulate the atomic structure or change the number of protons in an atom.
To change one element into another, a nuclear process such as nuclear fusion or nuclear fission is required. These processes involve the rearrangement of protons and neutrons within atomic nuclei, but they require extremely high energies and specific conditions that are not achievable in a household microwave or conventional laboratory settings.