i need edit contact from

Now the default contact fomr 1 is like the following,
<div class=”row clearfix”>
<div class=”col-4″>[text* your-name placeholder “Name”]</div>
<div class=”col-4″>[email* your-email placeholder “Email”] </div>
<div class=”col-4″>[text text-853 id:subject placeholder “Subject”]</div>
<div class=”col-12″>[textarea your-message placeholder “Message”] </div>
<div class=”col-12″>[submit “Send Message”]</div>
</div>
i need add three col, like add
div class=”row clearfix”>
<div class=”col-4″>[text* your-name placeholder “Name”]</div>
<div class=”col-4″>[email* your-email placeholder “Email”] </div>
<div class=”col-4″>[phone* your-phone placeholder “Phone”] </div>
<div class=”col-4″>[Country* your-countryl placeholder “Country”] </div>
<div class=”col-4″>[companyname* your-companyname placeholder “Companyname”] </div>
<div class=”col-4″>[text text-853 id:subject placeholder “Subject”]</div>
<div class=”col-12″>[textarea your-message placeholder “Message”] </div>
<div class=”col-12″>[submit “Send Message”]</div>
</div>
how to edit that. and the mail system can not work,when i sent mail via contact form ,i do not get any news