Custom Fields in Frontend

Hi, I have few custom fields, date, time, location that I want user to be able to add from front end and edit from there too, I think it would be really useful for everybody if you can show it how,
I found code like this

<div class="control-group">
<label class="control-label" for="post_slug"><?php _e('Slug','themeton'); ?></label>
<div class="controls">
<input type="text" id="post_slug" name="post_slug"     value="<?php echo $post_slug; ?>" class="post_slug"     placeholder="Type Slug">
</div>
</div

in frontend-edit.php

but I don't know how to add custom fields there to show, it will be really nice if you can show us, thank you