PLEASE, how to change the NAME of the url network?

[alkemis]

Good afternoon:

Our NGO has decided to promote a new era with new work philosophy based on the Economy for the Common Good.
We need to change the name of our URL network (on cyclos), but keeping all user and all movements.

For example, communities.cyclos.org/alkemis -------> communities.cyclos.org/atlantica
Please , how can I do it?
Thanks.

Regards
Ricardo