need help unbanning

[NvmySTYLE]

last night i used the command /rcon banclient and it worked like a charm, unfortunately it was the wrong client number and i have now banned a regular on our server.
i tried in vain to unban using the command /rcon unbanUser "a Lil' Puppy" to no avail. is there something i need to add to his name because of the spaces? how do i view and edit the ban.txt file? is there a way to delete the ban file altogether? (i could always reban the griefers if and when they comeback)
thanks in advance for helping a n00b out.

[holy_moses]

Using a text editor, open the "ban.txt" file now located in the server's \main folder. Search for the player you wish to unban and delete his line entry.

-Moses