@Vinay1 I think that you can achieve what you want by adding something like the following script to the Client Script field…
frappe.web_form.after_load = function() {
let $brand = $('.navbar-brand'), // This is the logo in the navbar
$user = $('li.logged-in'), // This is the logged in user navbar item
$header = $('.web-form-header'); // This is the form header that contains the header "User Registeration"
// Change the logo
$brand.empty().append('<img src="my_new_logo.png" alt="My New Form"/>');
// Hide the logged in user navbar item
$user.hide();
};