OS X V10.7 Lion :: Insert Symbol From Junicode Font?

I have a document in which I need Old English characters such as thorn, eth, ash and yogh. I have installed Junicode and it shows up in my font book, displaying all the characters I need under 'repertoire'. However, if in the word document, I go on INSERT/SYMBOL, the menu only displays a minimal number of characters and certainly not the ones I need. (This is where, on my PC, I had been able to choose the respective character and assign it a shortcut).