There are basically 3 ways for you to find out how to contribute. This applies to publications not listed in here as well.

1. Look for a story in their publication that is about how to write for them. It’s usually one of their oldest stories and may have moved to the bottom.
2. Look for a link in the publication top area that says something like “about us”, “write for us”, “how to contribute”, …
3. If you can’t find it in there, try smedian.com.