Where in the Constitution is the preamble located? nowhere - it is a separate document at the end at the beginning in the First Amendment.

The Preamble in the constitution is located at the beginning of the document ... The definition of A Preamble is an introduction

Therefore the Preamble starts off the constitution by saying

"We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America"