To log out, click on your profile image at the top right and go to "Log Out" option. You'll be redirected to https://youinstance.atlassian.net/logout where you'll have to confirm.
To login go to the instance url and if you are not logged in you'll receive a prompt to do so. If you don't receive one, is because you are still logged in but maybe that user doesn't have access to any projects. Try on a incognito window to make sure you are not logged in still.
Cheers
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