How to add prefix to every copter in Erle-brain using Mavros

edit

So, i have bought Erle-brain v3 that included ROS kinetic. Erle-brain automatically runs roscore. And i don't understand how to rename topics (or add prefix). It needed for dividing topics`information from each other. I mean, we have for example list of topics:

/mavros/global_position/global

/mavros/imu/data

etc.

And i want to get:

/copter1/mavros/global_position/global

/copter1/mavros/imu/data

...........

/copter2/mavros/global_position/global

/copter2/mavros/imu/data

...........

Maybe i must somehow disable autorun of roscore? Or do something in bin directory. (sorry for maybe uncorrect question: newbie)