Basic Author - Set up in Permissions but does not appear in blog post editing options

Site URL: https://chicaconciclo.com

Hey there, 

I just set up a basic author for my blog. The name appears in my Permissions settings. However when I create a blog post, I cannot select her as an author, and only myself comes up as an option. 

Could anyone give me a hint? 

I followed these guidelines: 

https://support.squarespace.com/hc/en-us/articles/205810518#toc-edit-a-basic-author-profile

https://support.squarespace.com/hc/en-us/articles/221530967-Managing-blog-post-authors 

To my understanding, once I save the basic author in Permissions, it should come up as an option in my blog editing settings but somehow that is not happening.

Thanks very much!

Rena