How can remove the write-protection on the BeagleBone ?

I’m using the Beaglebone in IoT mode with the latest debian image.

I tried to modify the name of the Beaglebone disk and modifying its icon, as I need to modify start.htm, when I try to modify it or copy an image, an alert is displayed this disk is write-protected,

so how can I remove this protection? and how can Ichange start.htm?