Have a theme with several "bugs" need them fixed, ideally in a child theme or plugin

I bought a mercor woocomerce theme from Envato/Themeforest and need several bugs fixed

- need to fix the "submit" button on comment and review forms (it does not appear at the end of the form
(example 1: http://www.journeyinstruments.com/product/carbon-fiber-guitar/ under review tab
Example 2: http://www.journeyinstruments.com/youtube-channel-demo-video-overhead-travel-guitar-namm/)
- need to fix a problem with compatibility of WooCommerce extension (http://www.woothemes.com/products/catalog-visibility-options/)
- Need to remove the website/url field from comment form (for users who are not logged in)



Had a previous developer tell me it would take ~ 2 hours to fix these, but he does not have time.