You don't need "sign" your submissions to content pages — that's recorded automatically and shown on the History of the page. But you are definitely encouraged to sign your contributions to the Discussion page and any Talk page. Do this with four tildes (~). Here's more about signatures.
Wikipedia's guidance on contributing generally apply to Wikiversity as well. If you don't want your writing to be edited or redistributed by others, do not submit it.
Be sure to visit the Colloquium for general discussions. For real-time chat with other Wikiversity users, check out our Chat page.
