when you power up your midibox_ng the default.ngc is loaded. You can load your script by typing “load 8x8” into the terminal of Mios Studio.
If you want your script to load up by default you can either save your 8x8.ngc as default (you load your script and then type “save default”). This didn´t work always in my case though, I can´t tell you why.
Or you can open your script with the editor, copy all the content and insert it in the default.ngc manually.