If I started a refile do I have to complete it? I thought I didn't input something and then realized I did and don't need to refile anymore

As long as you have not submitted that Refile, it will not be transmitted to CRA. If you wish to "delete" the ReFile you began in error, once you start or open another return in your Online TurboTax account, you should see a little garbage can next to the Refile and you can delete that file. 

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