How to start over

Ok I’m not very good at this. My site has gotten completely screwed up over upgrading. I have successfully upgraded to 3 but I want to start over completely publishing from LR. What do I need to delete to make that happen? Thanks

Delete albums and sets from Lightroom Publisher.
If any happen to be left over, delete the remaining in Backlight Publisher

If you want to completely start from scratch, then delete all albums and sets and any current Lightroom Publisher instances.
Then upload all the Backlight files again, overwriting what’s there.