Please search before you post.
This question has been asked multiple times.
Searching for root gives you some possible solutions.
Nevertheless, the question is not related to C::B, but to the OS you use (most likely linux) and therefore violating our forum rules.
Topic locked !
By the way, if you have C::B related question in future, it would be helpful to know which OS (and version of it) you are on and which version of C::B you use.