Liquid Theme problems. SEO

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So I am using Hike SEO to help our business with their local search results and general SEO improvements. These two programs do not communicate well together and effectively i cannot amend any of my main page or header tags (H1) as it is down to the theme apparently. Liquid theme is the theme we use we carries its own unique coding that only a paid for Shopify "Expert" is trained is writing. So I cannot amend my own page and title tags and my we performance is really suffering. Shopify advise that i can only fix this by putting down money for an expert and a completely unknown sum of money at that of course as who knows how long the fix may take!

Any help or advice would be absolutely great!