Upon receipt of a mail ballot, an elector shall mark it, sign the return identification envelope, and comply with the instructions provided with the ballot. The elector may return the completed ballot to the county auditor by mail or, before five p.m. on the day before the election, to any other place of deposit designated by the auditor. If the elector returns the ballot by mail, the elector shall provide the postage, and the ballot must be postmarked no later than the day before the election.