Hello My Friend Karen Baliska .
In you case its too easy.
Just log in to your account.
Go to " my account "
Select your " Hub " ( hub topic ) which you said that you not published.
On this page, On the top most there are some tabs like
* edit * stats * delete * tools: * start a new hub
Now select " edit "
And here you can change every thing.
This may resolve your problem.
Thank you. Have a nice day.