How to get started with Subversion on Sourceforge

1. On your SourceForge project page, choose "Subversion" from the "Admin" menu.
2. Check the box beside "The following box should be checked to enable Subversion:" and click Update. (Note: you may also want to disable CVS from the Admin | CVS page).
   
3. Prepare the folder that has your source code in it by removing binary files that are generated by your compiler (e.g. remove "bin", "Debug", "Release" folders), so you are only left with files you want to put in the repository.
   
4. Install TortoiseSvn if you haven't already.
5. Assuming your root folder is called "MyProject" and the "unix name" of your project on SourceForge is "myproject", right-click on the MyProject folder (on your hard drive) and choose TortoiseSVN | Import...
   
6. As documented here, use https://myproject.svn.sourceforge.net/svnroot/myproject as the URL of the repository. Then click OK and your files will be uploaded.
   
7. Unfortunately, the MyProject folder is still not associated with the repository; you are required to "check out" the files, which means downloading them, in order to complete the association between the files on your computer and the repository. To accomplish this, first rename the MyProject folder to MyProject2--or just delete it, as you probably don't need it anymore. Then make a new MyProject folder, right-click on it and choose "SVN Checkout...". Use the same repository URL as before: https://myproject.svn.sourceforge.net/svnroot/myproject. Click OK and the files are downloaded.
   
8. Now when you recompile your project, the object files and stuff will come back (e.g. in "Debug", "Release" folders). You can ensure that TortoiseSVN won't upload a file/folder by right-clicking on the file/folder and choosing TortoiseSVN | Add to ignore list | filename.
   
9. After making changes to your program, right click the MyProject folder and choose "SVN Commit..." to upload the changes. TortoiseSVN will update existing files in the repository automatically, but you need to check the check box beside new ("unversioned") files. Then click OK.
10. When sharing a repository with other people, you must frequently right click the MyProject folder and choose "SVN Update" to download changes made by others.
11. To learn more about Subversion and TortoiseSVN, read the truly excellent TortoiseSVN manual, by right-clicking on any file and choosing TortoiseSVN | Help.
12. When inviting other developers to your project, point them to this other handy tutorial.