You have to specify the type inside the array key called type.
<?php
// textarea field for large text
array(
'label' => 'Textarea Field',
'id' => "_your_id",
'type' => 'textarea', // specify the type field
'placeholder' => 'Type...',
'default' => '',
'conditional' => array()
)
?>
Use our function called tpmeta_field(‘_your_id’) and pass the above array id key to fetch the metadata. Since the function tpmeta_field(‘_your_id’) will return the value so you have to echo the value.Â