The Flow Library will no longer automatically detect updates to modules on npm. (see this post for the background).
Adding a new node to the library
If you have a new node to add to the library, click on the
+ button at the top of flows.nodered.org and select the 'node' option. This takes you to this page. Then follow the steps on the page to submit to the node to the library
Updating an existing node
If you have published an update to an existing node, you can either resubmit it the same way, or use the 'request refresh' link in the sidebar of the node's page (only visible if you have logged in).