Maryland Code, Election Law § 3-304

(i) by information provided on a voter registration application by the same methods provided for registration pursuant to Subtitle 2 of this title;

(ii) by written notice, signed by the voter and sent by mail or otherwise delivered to the local board in the county where the voter's current voter registration address is located or to which the voter has moved;

(iii) by making application in person at the office of the local board in the county where the voter's current voter registration address is located or to which the voter has moved;

(iv) by information on a voter authority card or other appropriate form filled out in a polling place; or

(v) by changing a name or address with the Motor Vehicle Administration.