If you have access to the account owner’s email, please reset his/her password to Kanban Tool. To do it, please go to https://youraccount.kanbantool.com and click I forgot my username or password and then enter the owner’s email address. A link to reset the password will be sent to his/her email.
After logging in to Kanban Tool you will be able to grant yourself access as an account owner. Do this from the People tab - click edit next to your name. Then, simply check all access levels: Project manager, account administrator, and account owner.