Wordpress Wordpress FTP access

Installed latest beta centminmod on a DO 512MB droplet. I then install wordpress on it.
So far so good.

I can use ftp program to access the site using domain name, root and the password (same as ssh password) to connect to the server.

However, when I use the same credentials to install WP plugins, it said the login data is not correct. I read that there are new ftp user created in the latest centminmod. Tried that too.
When I do

Code:

#pure-pw list
beamxxx            /home/nginx/domains/domain.org/./
#pure-pw show beamxxx

Login              : beam1511
Password           : xxxxxxWbHYrbVtX1
UID                : 1000 (nginx)
GID                : 1000 (nginx)
Directory          : /home/nginx/domains/domain.org/./
Full name          :
Download bandwidth : 0 Kb (unlimited)

Upload   bandwidth : 0 Kb (unlimited)
Max files          : 0 (unlimited)
Max size           : 0 Mb (unlimited)
Ratio              : 0:0 (unlimited:unlimited)
Allowed local  IPs :
Denied  local  IPs :
Allowed client IPs :
Denied  client IPs :
Time restrictions  : 0000-0000 (unlimited)
Max sim sessions   : 0 (unlimited)

Do I have to do something?

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Yes. Thanks
I use the FS_method direct and it works.