cannot access hdfs even though hadoop is (apparently) installed on CentOS server

I’m attempting to install SparkBeagle https://github.com/NGSeq/SparkBeagle on a CentOS server, following instructions on https://linuxconfig.org/how-to-install-hadoop-on-redhat-8-linux.

I’ve opened an issue on their GitHub page, but I’m not getting a response. I’m just trying to follow the instructions on their webpage. The installation proceeded well, and I assume that means SparkBeagle was installed correctly, but then why can’t I access hdfs?

I’ve installed the hadoop-3.3.0 tarball into a directory, and made the changes to the .bashrc file, but I still can’t access hdfs command.

Why isn’t this package working? How can I access the hdfs command?