plugins – Where can I post my registration form?

I am developing a website under wordpress / woocommerce.
I would like to create a personalized registration form.

I started adding this code to my "functions.php"

function registration ($ atts) {
return wc_get_template (myaccount / signup.php);
}
add_shortcode (& # 39; woocommerce_signup & # 39 ;, & quot; inscription & # 39;);

and after creating a basic form, I can see it in my interface but i do not understand where i post my form and how i save other fields as user and email.

Thank you