Hi Guys,
Our server runs CentOS 6 here on Linode. I had created a user with the following command:

[root@myserver1 ~]# useradd -c "myApp FTP User" -s /bin/false -d /var/www/vhosts/myapp/httpdocs ftp.myapp

Now, it turns out that the (FTP) user I had created, ftp.myapp now requires shell access.
I have attempted to grant the user shell access by editing the sshd_config file (which is located here /etc/ssh/sshd_config)
I added these line to the file:
AllowUsers myApp
But when I try to login as this user via SSH (I use putty), after inserting the username and password on the command prompt, the screen exits.
What am I missing here?

I would appreciate any useful input/suggestions.

Thanks.

Try running

chsh <user>

and change it to /bin/sh that will change the shell to the default one on the system

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Thanks...

It turns out that I am not quite there yet.
I still need to grant this user root privileges or sudo rights for some of the admin work the user wants to carry out.
How can I achieve this?

Thanks.

I believe you can add an existing user to the admin group by using the usermod command.
It should be

usermod -a -G sudo <username>