Stockfish is completely free and therefore we can't guarantee support, but there are a few ways to get help.
1. Knowledge Base
Help yourself by browsing articles on getting started. Try this first before posting a question.
2. TalkChess Forum
If you couldn't find what you were looking for, try posting your question here. There are many people at this forum who can answer your question.
3. Stockfish Discussions
As a last resort, you can open a ticket with the Stockfish team.