Global Settings -> Page Customization -> Header/Footer
Once a link is added, you can’t change it’s place. Links are being placed in the same order, they were added. So if someone adds all social media links, except one (as that person could forget about it), then other links, and at the end, that person adds the remaining one social media link, it looks chaotic and the only way to fix it is to remove all links and start from the very beginning. Not very convenient.