Purab

which version you are using for old site and new site. Than I can help you.

use the simple wordpress method
wp_header(‘custom-link-path’);

it tries to include the php installation path in linux. May be you need to consult with wordpress and PHP developer.

wordpress is not able to change the .htaccess file. Somebody must be hacked your server or site. .htaccess file related to apache server setting.

in wordpress admin section you need to change setting for reading section. that will solve your issue. One more advise for showing first 5 post you dont need to use any plugin. that is wordpress default functionality.

that is default widgets which are hardcoded in your theme code. You need to consult with theme developer

you need to change the theme code as well as css code. that will solve your issue

what is TMA

In functions.php add following line.
add_theme_support( 'post-thumbnails' );
ad use the featured thumbnail using following code
<?php the_post_thumbnail();?>`

There is folder permission issue on your hosting path.

Go to your hosting path using filezilla or any ftp client and give the following folder 777 permission.
D:\Hosting\5596920\html/wp-content/
that will solve your issue.
if your are using the shared hosting then you will see only wp-content folder. select that folder and give 777 permission. that will solve your issue.

you need the create the different template page and edit the code as per your need and assign your template that page.

[Removing email – Please stop this.]

Use the following code in your functions.php file.

<?php
    add_action('init', 'create_portfolio');
    function create_portfolio() {
        $portfolio_args = array(
            'label' => __('Portfolio'),
            'singular_label' => __('Portfolio'),
            'public' => true,
            'show_ui' => true,
            'capability_type' => 'post',
            'hierarchical' => false,
            'rewrite' => true,
            'supports' => array('title', 'editor', 'thumbnail')
        );
        register_post_type('portfolio',$portfolio_args);
    }
?>

This will give you option to create your portfolio. Check your admin section -> left side menu-> portfolio section

tell me which hosting service you are using. based on that you need to change the host name that is important. All database host is not a localhost for all the hosting provider.

which wordpress version are you using.

just use the following javascript upperside of iframe.

// Firefox worked fine. Internet Explorer shows scrollbar because of frameborder
function resizeFramere(f) {
f.style.height = f.contentWindow.document.body.scrollHeight + "px";

//window.onload = alert(navigator.appName);
}

call this function in body onload section.