git - How should I use SVNX?

Question

I have never used SVNX before and don’t know how to use it.

After searching on the Internet, they all said to add a Repositories first, but what should I do if there is an error after I add it?
The URL was given to me by someone else, as were the name and password. TortoiseSVN can be used on win, but now I am using MAC. Is there any solution?