Footer social media links not working

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Hello, in the images above are two of my concerns in regards of setting up social media on the footer part of the website, as well as changing the favicon.

Image 1: This image shows 2 circled items, the white circle is what I like to keep in my footer and the red circle is what I'd like to remove and need help in doing so thank you. And I'd like to know how I could link my yt channel, instagram, tiktok and facebook in the footer where the social media icons are shown (in the white circle), but I can't seem to get rid of the other social media icons that I won't be using, such as tumblr, snapchat, pinterest etc.

Image 2: The favicon next to the red scribbles, I would like to change. I tried changing it by going to Shopify admin > store > customise theme > edit themes > logos > favicons and changed the image in it but it still doesn't work.

Thank you.