Embed Iframe is a plugin that will let you embed iframe – an HTML tag that allows a webpage to be displayed inline with the current page, in a WordPress post. Although an iframe can lead to a complicated website, it can be very effective when used appropriately.
Use following tag to insert another page in post using iframe
[iframe url width height]
[iframe http://example.com 400 500]
- Download EmbedIframe plugin
- Copy to your ‘/wp-content/plugins’ directory
- Activate plugin
You can find full details of installing a plugin on the plugin installation page