You might wonder why you should allow another author to post on your blog. It boosts your SEO (search engine optimization= you might rank higher on Google as a result).
You can add a fellow scribe as a WordPress user: https://wiredimpact.com/support/adding-guest-author/
You can also ask a friend to send you the texts and images, and post them yourself.
Finnish author Rebecka Jäger writes post-apocalyptic adventures. Read the author interview of Rebecka Jäger by Fiona McVie.
Rebecka publishes her book on Amazon Kindle Store and as paperbacks, hardcovers via Barnes and Noble.