Ah. So if I understand this correctly now, the Blogroll category is still there, but you were instructed to delete all of the links that were associated with it. Please correct me if I’m wrong.
The links that are created under the blogroll category by default are just links to various wordpress sites (documentation, support forums, themes, etc) and really aren’t terribly important for your site. The links themselves are useful, but you were probably instructed to delete them because you’re going to want to replace them with links of your own, to other blogs or sites that you enjoy.
If you go to Links->Add New in the admin interface, you should be able to create a new link by doing the following:
1. Type in a friendly name in the “name” box. e.g. “Google”
2. Add the url in the “web address” box. e.g. “https://www.google.com”
3. Under the categories header, check the Blogroll checkbox.
4. Click the blue “Add Link” button on the right side of the screen.