If you are using AnyWhere Elementor Pro to create a single post template (or anywhere else you would use the author meta), you can use this bit of CSS to add text before the author’s name.
In this example, I am adding the word By and a space so that the author meta looks like this – By Sniffle Valve – instead of just – Sniffle Valve.
Change the text between the double quotes to fit your needs.
/* Add text before author meta */ .ae-element-post-author:before { content: "By " }