The Council may by an affirmative vote of two-thirds (2/3) of all of its members submit to the electors any proposed amendment or amendments to the Charter; or upon the receipt of a petition signed by not less than ten (10) percent of the 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 this Charter, the Constitution and General 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 General Laws of Ohio.