How do I change from archive to trash in my gmail email? Thank you

Settings>Mail, Contacts, Calendars>Your Gmail Account>Archive Messages>Off.

GO TO MAIL, CLICK ON EDIT OPTION, SELECT THE DESIRED MAIL, CLICK ON MOVE, PUT IT INTO TRASH. AND THEN FROM TRASH DELETE IT.

Settings > Mail, Contacts, Calendars > Your Gmail Account > Account > Advanced > Under move discarded messages into: check deleted mailbox

this worked for me! !