How to remove coupon from cart

Find and Open this path file:
catalog/view/theme/template/checkout /confirm.tpl

Find this code:
<div class="content">
<form action="<?php echo $action; ?>" method="post" enctype="multipart/form-data" id="coupon">
<p><?php echo $text_coupon; ?></p>
<div style="text-align: right;"><?php echo $entry_coupon; ?>&nbsp;
<input type="text" name="coupon" value="<?php echo $coupon; ?>" />
&nbsp;<a onclick="$('#coupon').submit();" class="button"><span><?php echo $button_coupon; ?></span></a></div>
</form>
</div>

Delete it and refresh your page. The coupon in cart will be removed

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