Refining the site at OPENCART

Requires the revision of the site on OPENCART - you need to make sure that the goods are loaded from the price.
I started the site with YouTube lessons =) it turned out to be a little bit small. I got stuck after I started downloading goods using the price list, installing some plugin for this. I can’t remove it now and I can’t continue. Something's been damaged there. I really want the site to work and that goods can be downloaded using prices. Or do you have to edit it on the site or are there other options?

I'm really waiting for an answer!!!