use <meta http-equiv="X-Frame-Options" content="allow"> in the one to show in the iframe to allow it.
<meta http-equiv="X-Frame-Options" content="allow">
The X-Frame-Options is defined in the Http Header and not in the <head> section of the page you want to use in the iframe.
<head>
Accepted values are: DENY, SAMEORIGIN and ALLOW-FROM "url"
Use target="_top" attribute in anchor tag that will really work.
target="_top"