If the user is not yet active, you can activate it by sending an email notification.
See steps below:

1. Go to Admin > click Users. 

2. Select the users that you would like to activate. 

3. In the Actions drop down menu, select Activate Users.

4. A pop-up screen will show up, click Activate. By clicking activate we will send out      an activation email to your users so they can start managing their expenses. 

NOTE: Sending an activation e-mail to the users you activate is crucial so users can set up their password for their account.

To know more on how to add users, see article: 

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