Updating WordPress plugin using subversion.  The plugin/theme author will need to grant you access.

Plugin author – add contributor as a “Committer”

1. Goto plugins administration page

   http://wordpress.org/extend/plugins/YOUR-PLUGIN/admin

2. Add Committer
   wordpress.org username

For contributors

1. Install client software
• Command-line client
• Windows client (Tortoise)
2. Create a folder on local PC for code
3. right-click folder -> SVN Checkout
4. URL of repository http://plugins.svn.wordpress.org/YOUR-PLUGIN
5. make changes to the trunk (don’t chg “stable tag” in readme until ready to release)
6. commit (this does not publish, just makes the file available in the repository)
7. when ready to release next version
1. update version in php file
2. update “stable tag” in readme file
3. right-click in folder -> TortoiseSVN -> Branch/tag
4. right-click SVNcommit

Related Reading

• Documentation on Codex
• The subversion Book
• How to Publish a WordPress Plugin