You can manage and view all attributes that you are using within your Accredible account by click the the "Attributes" tab in the top menu. In this section you will be able to see an overview of all the attributes you are using & the use count for each one. You can also use this section to make mass edits to your custom attributes or to delete them entirely.
To edit your attributes just click the circle menu next to the attribute you want to amend. You can then edit either the name or the type of Attribute you are using.