Deleting users

When you check an author for deletion you are taken to another page where you can have his posts deleted or assigned to someone else in the confirmation dialogue.

I would also like to delete a user that I added by mistake but on the user tab there is no delete options.

I only have the options to change them from subscriber to contributor etc etc

I have checked everywhere and can find nothing regarding reducing levels to 0, I cannot even see any levels.

Please help if poss.

Can anyone help please, it’s driving me mad
(Just read the bit about bumping your post, have I just done it??)

I just need to remove a user that I added by mistake but the only options I have are for what they are entitled to do ie subscriber, contributor, Author etc etc.

No sign of any wqay to delete at all.
As I am new to this I have probably missed something so so simple, if so, I appologise.
Any help much appreciated.