Use the "visudo" command as root to edit the sudoers file. First make yourself a member of the wheel group.
The sudoers file is well commented and all you will have to do is remove the comment before a line that lets members of the wheel group use sudo.
change the line:
Code:
# Uncomment to allow people in group wheel to run all commands
# %wheel ALL=(ALL) ALL
to
%wheel ALL=(ALL) ALL
If you are unfamiliar with "vi", all you need to do is first use the cursor keys to move to the start of the line and press the 'x' key twice to delete the "# " characters. Then press ":wq" to save and quit vi.