A few hours earlier I bought a beaglebone and now I am trying to add nameserver 126.96.36.199 (google DNS) to /etc/resolv.conf. However when I open it with vim and try to add my nameserver, it gives me E21: cannot make changes, 'modifiable' is off. I changed permissions via chmod. (chmod u+rx /etc/resolv.conf) But nothing changed. I am still unable to write into resolv.conf file. What should I do?