Hopefully this should help you be able to sort out the artists a bit.
First of all, log in obviously and then on the left hover over content and there should be an ‘artists’ link:
Then you should have a list of artists on the right as below, if you hover on any of them you can then click on the edit option that should show up:
And then all the stuff to edit should show up:
Hope this helps, let me know so I can delete this page…