frontEndForm.php

<?php

/**
     * @param null $params
     * @return FieldList
     */
    public function getFrontEndFields($params = null)
    {
        $fields = parent::getFrontEndFields($params);

        $fields->push(HeaderField::create('form-header', 'Recipe Form', 3));

        $fields->changeFieldOrder(array(
            'form-header',
            'Title',
            'Summary',
            'Image',
            'Description'
        ));

        $imageField = FileField::create('Image')
            ->setTitle('Image')
            ->setFolderName('Uploads/RecipeImages')
            ->setRightTitle('Only JPG, PNG or GIF files allowed.');
        $imageField->getValidator()->setAllowedExtensions(array('jpg', 'jpeg', 'gif', 'png'));

        $fields->replaceField('Image', $imageField);
        $fields->replaceField('Description', SimpleHtmlEditorField::create('Description')->setTitle('Recipe Description'));

        $fields->removeByName(array(
            'URLSegment',
            'Approved',
            'ApprovedByID',
            'ApprovedDate'
        ));

        $this->extend('updateFrontEndFields', $fields);

        return $fields;
    }