Query Editor - Can't Delete Table

I started process of Get Data and chose a table in my Excel book. Then started step 2 Edit. Before I could do editing I saw the message you have unsaved query somethings so I clicked it. Now I can't edit my table (it seems) and I can't delete the table and start over. Needs to be edited, mainly changing number column to text (071 needs to be 071, not 71).  I did have some blank cells in a column and that's ok but got error.  Just want to start over.  Suggestions?  Thanks,  Jeff