Rows K, L, M in the “websites” spreadsheet. Backlink #1, Backlink #2 and Backlink #3.
Enter backlinks in spintax format if you want to randomise:
You can use spintax however you want in those 3 fields. One backlink cell is filled in, that means 1 backlink per article, two = 2 backlinks, all three cells are filled in = 3 backlinks.