Window ▸ Share on Web Server serves a read-only copy of the document to your local network — colleagues on the same Wi-Fi open it in any browser, live. Edits re-publish as you save; encrypted pages are excluded; the server stops when you stop it or quit.
You'll always know when it's on: a checkmark appears next to Share on Web Server in the Window menu, and a “Sharing” badge lights up in the toolbar. Choose the menu item again — or click the badge — to stop.
Share as many as you like — the menu item belongs to the window you are in, so each document is shared and stopped on its own, and the checkmark tells you about that document rather than about the server. Each one gets its own web address built from its name, and the address you land on with nothing after it lists everything currently shared, so a visitor can be handed one link and find the rest. Every page also carries an Also shared list in its sidebar. Stop sharing the last one and the server shuts down by itself.
Settings ▸ Files & Backups ▸ Sharing on your local network. Left blank it uses 8080, and if something else on your Mac already has 8080 it quietly moves to the next free port. A port you type in is used exactly: if it's taken, sharing tells you so rather than serving somewhere you were never told about — which is the behaviour you want from the setting you chose deliberately.
While a document is shared, MojoPad announces the server to the local network, so other devices can find it without anyone reading a URL aloud. On a Mac it appears under Bonjour in Safari's bookmarks; phones and tablets show it wherever they list nearby services. Handy in a meeting: start sharing, and everyone in the room can reach it from a list.
This is for quick sharing in a room. For publishing to the world, use Static Publishing.