Are you talking about linking to a specific post#?
I link all the time, helps to have BLF open in two browser windows. Copy the link from a thread you want to reference from the address bar, go to the other window and paste anywhere. If you want to link to a particular post, click on the number of the post, then copy the address from the address bar.
If you want to do an imbedded link, follow those steps, but instead of paste, highlight the word or phrase, click on the chain icon (two left of the anchor), then paste.