What I must do to have marketplace in editor ?
You will need to download the UE4 Launcher from the main site.
Go HERE and then sign in with your account, there will be a download link for you there.
You mean there is no other way to have access to marketplace ? In case how I can use it under linux ?
Sorry I did not realize you meant for Linux, I am not sure what the answer is on that platform.
I’m going to move thread over to the General Discussion page (and edit the post title to include Linux) so more people will see and hopefully have an answer.