VisualSVN is only for visual studio integration. This type of work needs to be done outside VS and with the TortoiseSVN Shell itself.
The specific TortoiseSVN command is "Relocate":
If your repository has for some reason changed it's location (IP/URL).
Maybe you're even stuck and can't commit and you don't want to
checkout your working copy again from the new location and to move all
your changed data back into the new working copy, TortoiseSVN →
Relocate is the command you are looking for. It basically does very
little: it scans all entries files in the .svn folder and changes the
URL of the entries to the new value.
Edit
From the OP's comments, if you just want to start from scratch and not retain any history:
- Perform an "export" of your project from your existing repository. This will simply download your project without any SVN hooks.
- Create a new and empty project on your SVN Server. (this is step 1 in the below steps)
From here, you'll want to perform what is known as an "Import in Place":
4.2.2. Import in Place
Assuming you already have a repository, and you
want to add a new folder structure to it, just follow these steps:
Use the repository browser to create a new project folder directly in
the repository.
Checkout the new folder over the top of the folder you want to import.
You will get a warning that the local folder is not empty. Now you
have a versioned top level folder with unversioned content.
Use TortoiseSVN → Add... on this versioned folder to add some or all
of the content. You can add and remove files, set svn:ignore
properties on folders and make any other changes you need to.
Commit the top level folder, and you have a new versioned tree, and a
local working copy, created from your existing folder.