Custom HTML after product description

Please be nice to me, I’m very new to this WordPress system.

My site was set up by a 3rd party who did not finish as required, so feeling my way around.

Right…
When viewing a product, after the product description there are two boxes (side by side) headed with ‘Custom HTML’ and a photo then text saying ‘Odio, magnis. Et nisi. Facilisis, integer! Risus augue! Non turpis. Ac! Turpis, …..’

If there is no product description, the ‘Custom HTML’ boxes do not appear. Where do I edit these boxes or better still delete them please?

I’m running ‘Blanco’ theme with ‘WooCommerce’
These are the plug-ins;
Revolution Slider Version 2.0.3 | By ThemePunch
User Role Editor Version 4.19.1 | By Vladimir Garagulya
VarkTech Wholesale Pricing for WooCommerce Version 1.0.5 | By Vark
WooCommerce Version 2.4.6 | By WooThemes
Woocommerce CSV Import Version 3.0.5 | By Allaerd Mensonides
WP All Import – WooCommerce Add-On Pro Version 2.0.6 | By Soflyy
WP All Import Pro Version 4.1.3 | By Soflyy
WP-Paginate Version 1.3.1 | By Noah Cinquini

Thanks in advance for any useful advice.