i knew html and i did a website with login page
So, let's see it. Post the HTML code. Then, we can help you decide whether the Arduino is capable of doing the same things.
A login page is nothing more than a form with some text entry fields (typically 2) and a submit button and an action method. The Arduino is perfectly capable of serving up such a page.
The action method defines what to do when the submit button is pressed. If the action is to send the text field data as plain text to the server in another GET request, the Arduino is capable of handling that.
If the action requires more complex server side code or any client side code, the Arduino may not be able to handle that.