Example

$form = new Form('plugins-material-form-1', 'horizontal', 'novalidate', 'material');
$form->addPlugin('materialize', '#plugins-material-form-1');

$form->groupElements('user-name', 'user-email');
$form->setCols(0, 6);
$form->addIcon('user-name', '<i class="bi bi-person-fill" style="font-size:1.75rem;" aria-hidden="true"></i>', 'before');
$form->addInput('text', 'user-name', '', 'Name', 'required');
$form->addIcon('user-email', '<i class="bi bi-envelope" style="font-size:1.75rem;" aria-hidden="true"></i>', 'before');
$form->addInput('text', 'user-email', '', 'Email');

Your copy of PHP Form Builder is NOT authorized.
About PHP Form Builder License

<div class="row form-group">
	<div class="input-field col m6 s12">
		<i class="bi bi-person-fill phpfb-addon-before prefix icon-before" style="font-size:1.75rem;" aria-hidden="true"></i>
		<input id="user-name-material" name="user-name-material" type="text" value="" required class="form-control fv-group has-icon-before">
		<label for="user-name-material">
			Name <sup class="text-danger">* </sup>
		</label>
	</div>
	<div class="input-field col m6 s12">
		<i class="bi bi-envelope phpfb-addon-before prefix icon-before" style="font-size:1.75rem;" aria-hidden="true"></i>
		<input id="user-email-material" name="user-email-material" type="text" value=""  class="form-control fv-group has-icon-before">
		<label for="user-email-material">
			Email
		</label>
	</div>
</div>