Put the chart folders where ever you want them to be.

To load the charts into Maxsea, click File / Open (NOT Open Chart)

Navigate to the folder where the charts are.  Click on ANY KAP file (the individual chart files inside the folder), and click the Open button.  Maxsea will load all the chart files in that folder.  For multiple folders (ie Fiji, Vavau, etc), repeat for each folder.

These charts will now show up in a DIFFERENT window than the C-MAP (CM93) chart window that you are used to.  To switch between windows, click Window on the main menu, and then either Raster or CM92Ed2.  

Note that in Maxsea, these two windows are de-coupled.  The routes will always show up in both windows, but the current view (ie zoomed in or zoomed out, etc) and the layer files are maintained independently.  You can have a layer turned on for CM93 and not turned on for Raster and vice versa.  You can be really zoomed in in Raster and zoomed out in CM93.