[Closed] Change the language for user not available in the profile option

Background of the issue:
I try to change the language for the user, to have it in English. Unfortunately, I can't find the option in the profile. The site I need help with is hidden link. I am following the documentation at https://wpml.org/documentation/getting-started-guide/language-setup/setting-the-wordpress-administration-language/.

Symptoms:
The option to change the language for the user is not available in the profile.

Questions:
How can I change the language for the user in WPML?
Why is the option to change the language not available in the profile?