I feel your frusturation, I am starting from scratch pretty much with my Dream Recall. Melissa and Viking are right in what they say you just have to write down everything.
For example, last night I had three dreams, but I could only remember a fragment of the last dream I had, I remembered legend of zelda, as I was writing down the experience, the room I was playing it in for example, I remembered people in the room, I wrote down what they were doing, something they did reminded me of a dream I had before that, I wrote that down about a flood and whatnot, I then remembered more of the 3rd dream. eventually I remembered the first dream right before I did my WBTB.
Its a tricky process expecially when your starting out, definatly see what works best for you, I usually have the best luck, as soon as I wake up, lay there and try to remember as much as I can (dont focus to hard) then after about a minute or so, go and start writing, explaining every detail, I usually remember more this way.