You have two options. First, you can do this by going to eLocal > Widget > Widget Placement. Once done, you can then select the radio button of the corresponding product or products you wish to add the eLocal Widget. Lastly, click the Add Options button.
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The second option is to add our Widget modifiers manually in BigCommerce. Kindly check the quick video tutorial below on how you can do both options.

Quick Video Tutorial: Click Here!