Hi,why I do not have a SERVER MANAGER on my computer?Should I be a admin or somethong else?

Hi neshev,

Server Manager is installed by default as part of the Windows Server setup process. To use Server Manager, you must be logged on to the computer as a member of the Administrators group on the local computer.

If you are using client system please install the relevant edition of RSAT tool, you can refer the following KB details information:

Remote Server Administration Tools for Windows 8.1

https://www.microsoft.com/en-us/download/details.aspx?id=39296

Im glad to be of help to you!