You should go check out the manuals on xmos.com. Click support at the top, then documentation. Find Design Tools and take a look at the tools user guide PDF. Work through the first 2 sections at least, getting started and using the XDE. There are other good guides up there as well.
Don`t expect to read and remember everything the first time. PDFs are searchable so if something stumps you just throw some keywords around and see what comes up.