How do i tag any appendices mentioned in the diary pages - I've been referring to reports etc with their reference as there is a tag for that - but I cant work out if/how to tag the reference for an appendix when it is mentioned on a diary page in the right hand column.
You don't! There was a "reference" tag for this but it got removed as it was a free text box and was being used for all sorts of random entries rather than what it had been intended for. The important thing is to classify and then tag the Appendix itself when you come to it, not the reference to it in the diary text.