Add a member to dynamic group

Hi to all, 

I have a dynamic group , but what I want to use that dynamic group for SelfService and I granted the permission to Managed by. When I open the SelfService in web on My manage Resources I can see that Dynamic group but to add members is not possible. How can I change , I dont want to break the rules , the dynamic should stay like it is but only I need to work in SelfService to use that dynamic group to add the members manually.