Linux SVN NEW USER creation and SVN files checkout

I want to retrieve the SVN repository where files have been upload and download the files to my local computer and also create new users with the ability to downloads the files. I have the root creditentials for loggin into the linux server. The user here is that I have forgotten the user name and the passwords I used to loggin on via Tortose SVN.
Skill with SVN installation and management on Linux is required.