For confirmed bugs in the software, you can post the problem and solution in the Bug Reports section of the forum. If there's a discussion already in another area, post a link to that other discussion for reference, but ideally include the complete solution in the Bug Report. It should also clearly explain which version/s are affected by the bug.
If you're contributing code fixes, and are comfortable with software development tools like "git", then submitting the code on Github is recommended. The process is documented here: http://docs.zen-cart.com/Contributing/main with links to detailed steps on how to use git and github.
Anything submitted on github will have a code-review by the dev team, and if approved will be merged into the next release.
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