To add a solution to SVN with Ankh, first setup the repo in VisualSVN. Then go to Visual Studio and open the solution. In the solution explorer, right click on the solution name and click "Add Solution to Subversion." You'll then be able to specifiy the repository to which it should be added, e.g., "https://1.2.3.4:8443/svn/myproject/".
If your solution is already in Subversion, Ankh should be able to pick up on it and provide you with status icons and right-click menu options in Visual Studio.
If want to browse your SVN repo in Visual Studio, go to View->Repository Explorer. Then you should be provided a nonintuitive-looking little icon that will say "Add Repository" when you hover it. Put in the address of your SVN repository, e.g., "https://1.2.3.4:8443/svn/myproject/". You can then browse the repo and open the solution file from there.