Blog posts follow the same format as journal articles. Italicise the name of the blog, the same as you would a journal title.
According to Ouellette (2019)...
Last name, Initial(s). (Year, Month Day). Title. Blog Name. URL
Ouellette, J. (2019, November 15). Physicists capture first footage of quantum knots unraveling in superfluid. Ars Technica. https://arstechnica.com/science/2019/11/study-you-can-tie-a-quantum-knot-in-a-superfluid-but-it-will-soon-untie-itself/