How to remove one single Icon

Thanks, I am new to this forum and I have a question about removing a single Icon from five that I installed in my Header. I had someone add these for me but he has disappeared and I might be wrong but I can deactivate one or all by removing the url in the Social Media Widget but it appears to delete just one Icon image then you would have to remove them all and then re-install the ones you want.
I assume that when you activate this Plugin you select all the ones that you want and it creates them in the Widget then you have to add the url for each one, that is how I interpreted everything.
I can deactivate it but the image stays on every page, I did not want it but he added it anyhow, so for now I will leave it as is. I am only a novice user of WordPress and have built 3 sites for my business.
Thanks