Apologies if this has already been covered in this thread:

PR1.1/N950: Adding a Google Talk service to a contact in the Contacts app, how do you remove this service once it has been added? Editing the contact shows a blank Google Talk field even though it has one (sometimes multiple) Google Talk services assigned to it, and if you add the wrong Google Talk details to a contact (ie. wrong email address) you end up with a "Failed" Google Talk service assigned to the contact that can never be removed. In addition to that, once you have added the service it then shows the associated user name and not the actual email address you entered, so if you want to view the email address for any reason, you can't. It's as if only a third of the UI has been implemented, with EDIT and DELETE missing or not yet implemented.

The inability to modify or remove Google Talk services from contacts makes the entire process rather fraught, as you have only once chance to get it right - get it wrong and you make a mess of your contacts as you need to try again until you get it right, and that's assuming the Contact app doesn't want to randomly merge your contact with another contact upon saving, and if you decline to merge it throws away all of your edits, which is just crazy bad UI design. It's not as if you get the option "Merge and chuck away all my carefully crafted edits", the only options are "Yes" and "No" to the question "Do you want to merge with contact X", with the obvious course of action being to continue editing if you choose "No". Instead, you go back to the list of contacts. /rant over.

Hopefully this is only a problem on the PR1.1/N950 release as I can't believe this will be allowed to to go live on N9s when that version of PR1.1 is released. Someone please tell me PR1.1 on the N950 is actually a Beta of what will be released on the N9.