What can I do with a 501 (c) (3) for a non profit organization. I never got this before and I'm confused on what to do. Thany

Your question isn't clear. but money or property given to such an organization would be a charitable contribution that would go on schedule A. if you need more information please post back and give an example if possible. 

Did you get a W-2 or a 1099-NEC for work you did for them? Unless you own the organization, you would not file for the 501 (c) (3) yourself.