First, you should package your contribution in a HWP archive, if this is possible or needed. Using HWP archives makes installation super easy for everyone.

Then, upload it to a reliable server. See the following question for a list.

After uploading your your contribution, you might want create a post in the Content Contributions forum to announce it to the public and to invite discussion. Please also read: Submissions: Guide and threads. Don't forget to post a link to the hh.unit22.org page or wherever you uploaded your file.

Finally, talk about your contribution in our chatroom or in the in-game chat.