That is a question for your ircd people I'm afraid.
Hint, you should probably change
userhost Username@*;
to
userhost *@*;
(which is a truly awful way to set this up..)
Then REHASH (to reload the config)
And then /oper Username password (literally).
If you are doing this on linux you might want to spend a couple of bucks on a shell that comes preconfigured with Unreal/Anope Services/Denora Stats out of the box so you can just get on with running your network.