Place the NSP files on your SD-Card, then start OSX and use the R-button to switch to the different menu's. One of the menu's is for NSP install, this isn't rocket science.
Download NSP. Put it on root of your SD. Go to SX OS menu and install it from there. Easy as pie.
i read something previously about dev menu's etc no worries thanks for ya help
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SX OS menu as in where you run XCI files from or the actual SX OS menu
There is a reason no one answered you...you guys suck balls at sarcasm