How to replace avatar image with name (username and name)

Thank you!
Hope someone can help

At the Mobile interface on the homepage

how to replace avatar image with name (username and name).
Meaning: I don’t want to show avatar, but I want to show name +username (on Mobile home page)

Before changing

After replacing:

This is the theme I found exactly what I wanted, but on mobile, the name (username) is not displayed (but the avatar image).

Can someone help me with the code?