You must have a LeanKit account in order to use the LeanKit iOS app.

When you open the app, click the link to "Add an Account". In the iPad app, to see this link you must first click the Accounts button in the upper left of the screen.  

In the User Name field, enter the e-mail address you use when accessing your LeanKit Kanban account(s). Click the blue Search button in lower right of the screen in the on-screen keyboard.

A list of the Organizations to whose LeanKit accounts you have access will appear. Click on one of them to open that account. You will be prompted to enter your password. Enter the password you use for that account.

The e-mail address and Organization name you have entered will now appear in your Accounts list. You may link to multiple accounts