how to change link of some wordpress pages

I’ve made templates for the pages of my wordpress site such as: singup,signin,suggestions.
Default wordpress pages link is as follows:

doamin.com/signup/
or
doamin.com/signin/
or
doamin.com/suggestions/

I want to just link to this page to be changed as follows:

doamin.com/panel/signup/
or
doamin.com/panel/signin/
or
doamin.com/panel/suggestions/

Using what code can do this?

Create a blank page and name it panel then go to your created signup template and select parent page panel. Its just below Publish->Page Attributes.

/*Add noindex to this page (Add to functions.php)*/
function add_noindex_tags(){
# Add noindex to page.
if( is_page('panel')  )
echo '<meta name="robots" content="noindex,nofollow">';
}
add_action('wp_head','add_noindex_tags', 4 );