I have received a workspace from
how can i Sign in into internal workspace for example to create a user, see mail queue, ...
You can't. Instance admin access on apex.oracle.com is restricted to the relevant Oracle staff.
You should log in to your own workspace using an account with workspace admin privileges to perform the tasks listed.
You can create other users who share the Apex workspace with you. They can be workspace administrators (like you), developers who can edit apps in the workspace, and users who can use the apps and, maybe, make comments. There doesn't seem to be any way to restrict who can edit which app, and no version control, so choose your users wisely.
Click the `Administration` icon in the upper-right corner (a little man with a wrench), then `Manage Users and Groups`, then the `Create User` button.
Thank you very much for your message. I have not seen the administration area at all.
You have helped me a lot.
Thank you very much