This is the 8803rd most frequent Russian word.
пользователь
User; someone who uses something, typically a system or service.
The word "пользователь" here refers to a single person who interacts with a system (account) and lacks access to its services due to a forgotten password.
Этот пользователь забыл пароль от своего аккаунта.
This user forgot the password to their account.
"Пользователей" in this context refers to multiple individuals who navigate and use the website, emphasizing how the design caters to these users.
Сайт имеет простую навигацию для пользователей.
The website has simple navigation for users.
Here, "пользователи" identifies a larger group of people that have accessed and registered within the system, highlighting the collective aspect.