You can learn everything about Backlink Adding using Free Backlinks sites list as follows.
Open the My Projects page in the header.
Click the Create Project button or click on the current project's name to open it.
You will be redirected to the page of your project.
In the table below, you will find info about Backlink Adding for each website:
Type of Backlinks
Type of indexation
Enter Done URL in the window that appears after you click the Enter Done URL button.
Add a comment in the window that appears after you click the Add a comment button.
Get instructions on placement, and also see an example of placing links on the site you are interested in in the window that appears after you click on the How to get button.