FileZilla FTP no access root/hive/xmrstak


Hi guys!
I have an issue where I want to manually change the config of the XMR stak miner, and add in dual threaded mining. I can access the amd.txt file in the xmr stak folder, but cant alter it. its write protected.
Do I have to alter it another place and reboot the rig for it to load it over or what? help!