How can I check in Maxsurf Advanced license?

I am trying to use Bentley License Tool but the check in button is not available. How can I make sure the license is checked in before using it on another PC ?

I tried to apply the Select.server site configurations suggested on the link http://communities.bentley.com/products/licensing/w/licensing__wiki/13916.how-do-i-restrict-license-usage-to-checkouts-only     without success, I keep getting the error:

An Error Has occurred:
An unexpected error has occurred. Contact your system administrator if the problem persists. See SS-AdminSite-WebServices.log for error details.

Exception Details:
Error ID: 4e01df87-1e42-49c4-98d3-a738a8352336
Where can I found a step by step guide to limit license overuse ? I have one license of Maxsurf that needs to be used on two different PCs (not at the same time obviously).
Why Bentley make things so complicated???????