The best way to get support for free plugins is to create a thread on the wordpress.org forum for the matching plugin. Support requests for free plugins are typically answered within 1 week. Free support includes basic troubleshooting and guidance. The level of support may vary depending on availability.
Here are links to the wordpress.org forum:
Pro customers receive the following:
- Requests are given a top priority over any other requests.
- In depth troubleshooting.
- In depth guidance.
- Styling and site integration instruction and assistance.
- Plugin extending/filtering assistance.
- Site assistance.
You will find documentation such as usage and developer docs for each product in the product sections.