Enabling/Disabling 'sudo' for Local User(s)

Fedora/RedHat based distros doesn't give sudo power to local users by default, So its the root who grants them the power. Here's a way:

1> Open Terminal / Konsole and then login as root :

$ su -

2> Change the permission of /etc/sudoers to read-write mode :

# chmod u=rw /etc/sudoers

3> Open the file using a texteditor (I am using vim) and search for :

# vim /etc/sudoers

## Allow root to run any commands anywhere
root ALL=(ALL) ALL

Below that add (by i in vim) this:

username ALL=(ALL) ALL

Note: Here you can add or remove users and may have more than one user

4> Save and close the file ( Q then wq in vim) and change permission back to default :

# chmod u=r /etc/sudoers

Alternatively you can also go for :

$ su -c /usr/sbin/visudo

It will open sudoers file in rw mode in vim editor