Thanks for reaching out!
I am not sure I understand what you are trying to achieve. Could you maybe expand a little bit so I can better assist you?
If you are talking about resetting your results, you will need to go to the experiment results page and click the "Gear" icon near the upper right corner. A dropdown menu will appear with the "Reset Results" option. That dumps ALL the result data for that experiment and starts from 0. Be careful, as dumped data is unrecoverable.
If you are talking about logging out of the Optimizely web application, then this can be achieved by clicking on your email address near the upper right corner. A dropbox menu will appear, then select "Log Out".
I hope that is helpful.