This Charter may be amended by either of two methods. The Council may by an affirmative vote of at least two-thirds of its members eligible to vote, submit to the electors any proposed amendment or amendments to this Charter; or upon petition signed by not less than ten percent (10%) of the registered electors of the City setting forth any proposed amendment or amendments to this Charter, the Council shall forthwith submit such proposed amendment or amendments to the electors in accordance, in each instance, with the provisions of the Constitution and laws of Ohio now or hereafter in effect. The Council shall determine the manner of submission of any proposed amendment or amendments to the electors to the extent that such submission is not governed by this Charter or the Constitution or the laws of the State of Ohio.