Ok I show You what I've done step by step
One again from the beginning.
1. Bought Raspberry PI 3

2. Installed system on Raspberry with NOOBS automatically (
https://www.raspberrypi.org/downloads/noobs)
3. Run system
4. Connect lan ethernet for internet

5. Open terminal
6. Time to install minera:
First i run this command:
curl -o- https://raw.githubusercontent.com/michelem09/minera/master/install_minera_ubuntu.sh | sudo bash
7. Waited for finish (minera downloads a lot of files and installed)
8. FINISH:
Minera gives me result:"DONE! Minera is ready! Open the URL: http://192.168.1.19/minera/ And happy mining!"
I go to this address and nothing there.
Help.About USB installation. Please HELP
uh? you have to boot from that SD Card not mount it in a pre-installed system.