Could you tell me where i can get instructions for installing sled 15. I m from Russia, My name is a Ivan. thank you in advance
Hi and welcome to the Forum 
All the documentation you need is here;
https://documentation.suse.com/sled/15-GA/
Hopefully you’re installing SLED15 SP1 which is currently the latest release available. Documentation is available at https://documentation.suse.com/sled/15-SP1/ though it should largely be the same as for SLED15 GA which Malcolm posted.
HTH.