The dropdown "Populate Page with" shows only those LDAP that have been certified as working with LiveCycle.
eDirectory is one of them from Novell.
So, it's not same as OpenDS, and neither are it's Unique identifier and other attribtues on User and Group settings page.
Yes you can use OpenDS, but for that you will have to leave the "Populate Page with" dropdown as blank.
When you reach Users/Groups settings page, you'll have to manually insert the attributes in compliance with OpenDS LDAP.
The "Test" button on the Top-Right corner of Users/Groups page is quite useful to check whether the configuration you specified are correct or not.
I suppose you forgot to add Authentication Provider in the domain alognside the Directory Provider.
Besides also check whether the said User is having "Administration Console User" role or not.
This role can be assigned via Home->Settings->User Management->Role Management and is responsible for logging you into Admin Console.