Hi,
Thanks for contacting us here.
This icon option was not there on the theme but we have updated it so all you have to do is to update the theme. First, download the theme from https://www.themespride.com/my-account/ and upload it from Appearance -> Themes. Upload the theme it will show you the option of “Update and replace”. Click on that and your theme will get updated.
Then go to Appearance -> Customize -> Theme Settings -> Social Icons at the end you will see TikTok URL option. Please make sure you install the WP Font Awesome Plugin so that the TikTok icon will appear.
Thanks