Choosing review apps as a newbie

New Member
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Hi there.  I am just building my store and will be ready to launch in a couple of weeks.  Like everyone, I am trying out some apps.   I was looking for a review app and wanted to start off with a free app, so I installed however I did not realise that I couldn't get photos on the reviews, so I deleted the app and installed another (Photo Reviews and Testimonials)


My problem is now that I think I may have caused a problem by deleting the app.  I deleted it from my app list, but then it still showed up on the page, so I deleted the last line of the product.liquid file where it was located.  Now I can't seem to install any review apps.


Could I have removed something vital from the product.liquid file?  Is this usually how to remove an app?