Customized Logged in button

Hi everyone !

Does anyone knows how to set up a customized logged in button on wordpress ?
I found this website that does exactly what I’m looking for but I can’t find the way to implement it on my wordpress. This website has been built with wordpress (https://cuevana3.io/)

These are the initials loggin and register buttons on the top right (in Spanish entrar means login and registro means register)

https://i.ibb.co/TPXtXPf/1.png

Then a pop up appears

https://i.ibb.co/y4f5Dtw/2.png

And after the registration/login, this customized logged in button with the nickname appears on the right side, I can then click on it to access my profile:

https://i.ibb.co/XsFqM8J/3.png

If anyone could give me a clue about how to get this that would really help !!

Thanks a lot for your time and efforts, I have elementor pro but can’t find a way

Alain