System user creation

[jekillen]

Hello folks;
I am trying to create a system user for a program to use.
I haven't found any specific instructions for doing this in the FreeBSD 
manual
or Absolute FreeBSD.
The program exits with an error saying it can't create/write to a pid 
file.
I believe it is the way I used adduser to create it and I don't know 
what
I did wrong. I assigned it the class bin and disabled the password and
assigned none as the home dir.
To remove mystery it is MySQL I am trying to get running.
This is the error file entry:
starting server errors:
060417 17:38:49 [ERROR] /usr/local/mysql/libexec/mysqld: Can't 
create/write to file '/usr/local/mysql/var/AMD64-939.<domain>.pid' 
(Errcode: 13)
060417 17:38:49 [ERROR] Can't start server: can't create PID file: 
Permission denied
060417 17:38:49  mysqld ended

Thanks in advance;
jk