The electors use rectangular cards as ballots with "Eligo in summum pontificem" ("I elect as supreme pontiff") printed at the top.

NPR: The Papal Transition: An Overview

"The supreme pontiff wishes to pray with us and for us, and to acquire first-hand knowledge of the hard conditions of our region, " he added.

BBC: Pope 'to visit Holy Land in May'

As Supreme Pontiff he has nobody to accept his resignation.

BBC: News Online

When a new pope has been elected, the Cardinal Dean or Cardinal first in order and seniority asks the elected person for his consent saying: Do you accept your canonical election as Supreme Pontiff?

FORBES: How Is A New Pope Elected?