Go to Profile › Settings › Account › Delete my account and confirm with your password. Your profile, photos, matches and conversations are deleted immediately and this can’t be undone.
Deleting your account does not cancel your membership. Cancel it first from Google Play or the App Store.
If you can no longer sign in, write to privacidad@datecito.com from your account email with the subject “Delete my account”. If you just want a break, in Profile › Settings › Privacy you can hide yourself from Discover and keep your matches.