Svnx doesnt have interface to switch the svn repository from one url to another. If you change your url , or move your repository to a new url you can do this.

Open the terminal
Using “cd” command to go to your repsoitory , e.g. cd /Users/yourname/websites/ ( your svn)
then run the command svn switch –relocate old_url new_url

if you want to check your old url , you can run the command “svn info”