To manually upload a new version, go to the project page and use the "Upload new version" button.

Provide the version string (like 1.0.0) and the file to upload in the form that comes up next. For javadoc, either a generated javadoc.jar or a zip file of the javadocs top folder needs to be uploaded.

Important: The javadoc should be generated with at-least package visibility selected. Without an overview-summary.html in the root folder, DocsHoster won't be able to host it.