Posting to the feed
Create post (bottom of the feed) opens a full-screen composer showing everything you can post: the works you created and the pieces you collected. Pick one, write a caption, @mention creators, post.
What you can post
The composer opens on All: a Created section (every collection you deployed on a mainnet, plus what this browser deployed) and a Collected section (artsunami pieces you hold on every mainnet, then the rest of your wallet when the Alchemy index is on). Tabs filter to one of them; the search box filters both. Testnet work never goes in the public feed - the composer says so when that is all you have.
Writing the post
Tap a work: it appears next to the caption at the bottom, and its title pre-fills the caption. Type @ and a name to mention a creator - the handle links to their profile. Post publishes it to the feed; a created collection carries a Collect button, a collected piece links to its page.
If a list looks empty
Lists reload every time the composer opens and whenever you switch wallets. If loading fails, the section says so with a Retry button - an empty list and a failed one are never shown the same way. Nothing under Created usually means this wallet did not deploy anything (or deployed only on a testnet).
Nami lives at the top of the Help center. It knows every topic in this center and can walk you through your specific collection, wallet or transaction.