Launch Steam, open your Library, and select a game that supports Steam Workshop. Scroll down to the Workshop section and select Browse the Workshop. If you don't see a Browse the Workshop button, that means the game doesn't support the Steam Workshop, and you'll have to try a different game.

How do I access the Steam Workshop?

You can access the Steam Workshop directly from your Steam library. When you click on a game in your library, and that game includes Steam Workshop support, you'll find a button that links directly to that game's Steam Workshop page.

How do I add steam workshop?

To upload your newly created package to the Steam Workshop, click the addons button and select Steam Workshop Uploader: Next, navigate to your created package (zip file), find a nice image for your item, and type in your Workshop item details, and click on Upload.