The Council may, by affirmative vote of five (5) or more of its members, 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 electors of the Municipality 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 of the State of Ohio.