Open Source Document Management System | OpenKM

my requirements :
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1) i want to login to portal with new role except AdminRole and userRole.
2) i want to configure to visible the uploaded documents to one few users based one the Roles.
3)i want edit the document by downloading the existing document and upload again .which should not show error like this document already exits.

And you want doing it without reading documentation ... that's not possible. Please take some time reading documentation, with few time you'll understanding what you¡ve got in your hands. I think all it's well explained in documentation.

That's the administrator guide http://wiki.openkm.com/index.php/Administration_Guide ( here's is explained how creating users, roles etc... )

That's the user guide http://wiki.openkm.com/index.php/User_Guide
( here's it's explained how setting secutiry credential to folders or documents )

To upload a new version document, FIRST you must DOING a CHECKOUT ( download document to edit )