All of the social icons that appear across your site are controlled by the "Social Links" variable.

One example of this would be your social links that appear in the website footer. These buttons require that the links be stored in a variable file, just like the one shown below:

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To edit the data behind variables such as this one, you will want to navigate to Site Settings via the left-hand menu:

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And then selecting the Site Variables option from the sub menu

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This area of the CMS will contain all the variables being used for your website.

Once you find the variable you are wanting to change, in this instance the Social Links variable, you can click into it to bring up the file.

Once the file has been updated with your new data, it can be saved. When saving a variable please ensure the "Publish" checkbox has been ticked 

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Now that the variable has been saved, you will need to publish out both the files and the whole site to ensure that your new data is pushed out to all pages on your website. Changes to variables may take up to 15 minutes to fully change following a site publish.