uploading custom icons

I am struggling to upload custom icons.

I am a novice, and do not understand the difference between URL and full path, which is what is required

I have created a file called icons in the WP-content folder and uploaded the icons which are named the same as the original ones, they just aren’t showing on my pages. I am thinking it is because of the URL and path names

Could someone point me in the right direction please

https://www.ads-software.com/extend/plugins/social-media-widget/