I am confused. Let me make sure I understand your question.
You want to have an iframe on a web page inside your website.
Ok. An iframe can be put on any page of your site, not just the home page.
the iframe which I make are not able to load a page that I want, the screen on my iframe towards login box on the web
You want to show the login page inside your iframe?
Usually you can get a log in screen.
But once you log in, you may or may not be able to stay in that iframe.
Are you expecting to stay "logged in" when you refresh your page?
It is controlled by the content page, and security options in the browser.
The page might have code in it that does not allow it to be used inside a framed webpage or iframe.
Would you like me to test and diagnose it? Please provide the address of the page with an iframe.