HTML in email or editor

I have a very old version of userfrosting, something that someone modify it for me.
I want to be able to put HTML code in email templates - there is a textarea form. Only there I need html.

How can I do that?
For example if I put now:

<img src-:..>

I receive:
&lt;img src=&quot;

This is my code:

<div class='row'>
    <div class='col-sm-12'>
    <h5>Email Body</h5>
        <div class='input-group'>
            <span class='input-group-addon'><i class='fa fa-edit'></i></span>
            <textarea name='body' style='width:100%;height:400px;'>$body</textarea>


Thank you in advance