I need help with creating a sidebar widget

I had someone recently changed the theme on my blog. One of the things I wanted was to have a place on the sidebar with the tile "best online money making posts" where I could add links to my best posts. He did make that, but I cant find any place where I can add the links to it.

I looked in the links category and pages, but cant find it. when he modified the them, I think he messed up somethings. For example, before he modified the them, in the link category I had "making money online" and "blogroll". However, I asked to remove those and instead place " best online money making posts" and "online money making sites". Which he did.

But, I can not see those in the link category section, and whenever I add a link, it goes to "online money making sites". I looked into the "Default Link Category" as well, and no matter what I put as the default, it always goes to "online money making sites".

I kind of think its a problem in coding that section, but I am not very familiar with coding, so I dont know what to change or. I could pay him to fix it, but I want to learn it myself since its just a small tweak that probably won't take much time.Does anybody has any idea what the problem is and how it can be fixed? I would appreciate any help. thank you.

if I didn't explain it well, you can look at the lower part of of the sidebar of my blog where you can easily see what I mean.