I changed the wordpress address and the site address of one of my sites to the address of another one of my site. Meaning I have two wordpress sites site1 and site2, I was experimenting and changed the wordpress address and site address of site1 to the URL of site2 . So now my problem is the admin login of site1 became the admin of site1, and I am no longer able to log back to site1 to undo what I did.
How can I fix this? Please help