I am brand new at biblios. I search and select bibs to edit, but when I try to edit, 1. the authorities all disappear (just white space where they were) 2. We use NLM subject headings. How can I specify a 650 - 2 tag? As it is, I added one 650 and it had an LC indicator which I could not change, and then 3. I was not able to add any more 650 tags at all. Thanks.