Thats the big problem with Octamed. Its interface is scary and there is a serious lack of documentation of how to use it.
There is a little bit of info on the Octamed web site but no actual manual. I know V6 of Octamed actually came with a printed manual but I have been unable to find it online. I know "the Goose" has a copy of it but I'm not sure if he could legally scan it and post it.
The PC version of Octamed works pretty much the same as the Amiga version so maybe you could get some info there?
I've thought about doing a short video tutorial of learning the basics of Octamed since getting started seems to be the biggest stepping stone.