How can I add a new namespace

How can use the " acm add" to add a new namespace?It always says you don't have the right for the new namespace.

Start by reproducing the reported permission error with the `acm add` command and inspect the command's namespace-creation entry point. Determine whether the failure is caused by usage, permissions, or implementation behavior; done means the namespace can be added or the required permission guidance is made explicit.

Written by the indexing model from the issue text.