To enable sudo for your user you need to edit the sudoers file and add your user to the the wheel group.
First lets edit the sudoers file.
Open a terminal and type visudo then hit enter.
Now scroll down until you get to the part of the file that looks like this:
now right under
root ALL=(ALL) ALL
you are going to put
your-user-name ALL=(ALL) ALL
After you do that the file should look like this:
root ALL=(ALL) ALL
your-user-name ALL=(ALL) ALL
If you dont want to have to type in your password when you use sudo remove the "#" from in front of:
# %wheel ALL=(ALL) NOPASSWD: ALL
So it looks like this:
%wheel ALL=(ALL) NOPASSWD: ALL
Now to exit and save the sudoers file type :wq! and hit enter.
Now to add you user to the wheel group enter:
usermod -a -G wheel your-user-name
There you go sudo is now set up