For those who cannot finish meeting in Opera here the solution
1- We have to go to the button of Opera then Settings and Delete Private Data
2- Then we open a tab in which we have to do click Detailed Options and then Manage Cookies
3- We have selected own-free-website.com and then we click on Delet and then in Close.
4- Then we are going to Login and we have to be disconnected.
Note: the process can help you to sign out in any website
Greetings!
Design-OFW