Find your Handshake name in the Domain Manager, select "Manage", and click the slider next to "Sell this domain" to set your name's "Buy now price" and list it for sale.
You can edit your listings' Buy now prices or remove them altogether in your Domain Manager's for sale page.
While some of your names may be more desirable than others, there's no reason not to list every name you own on the marketplace. Since you paid the second-highest bid price for every name that you won, you know there's at least one other bidder who's willing to purchase your name. Even if you'd only be willing to part ways with some names for 10x what you paid, you may as well list them to see whether someone will actually buy your names, especially because there's no cost for listing your names!
Namebase does a lot to help promote your name by emailing everyone who watched your name and/or participated in the auction as soon as you list it. With that being said, writing a compelling description for why your name is valuable will also help maximize the odds of your name getting purchased.
You can increase the likelihood that your names sells by proactively promoting your name externally as well. Here are some communities you can share your name with:
Twitter (tag #NamebaseMarket and we'll RT your post!)
In addition to posting your listing on Twitter, you can reach out to LinkedIn/Twitter contacts who might have an interest in your name
Handshake subreddit: r/Handshake
Discuss in the Namer Community the promotion channels that worked for you!
Find your Handshake name in the Domain Manager, select "Manage", and fill out the "Namebase nameserver DNS records" section as shown in the example below.
Your URL will now be accessible via your Handshake name at: "SUBDOMAIN.NAME/"
Create a new GitHub repository and name it "EXAMPLE.github.io".
In the Settings tab under the "GitHub Pages" section, click "Choose a theme" and select a theme.
Go back to the "GitHub Pages" section to input "home.namebase" as your "Custom domain" and save.
Now find your Handshake name in the Domain Manager, select "Manage", and "Add a new record" under the "Namebase nameserver DNS records" section with the following inputs: CNAME (Type); home (Name); EXAMPLE.github.io (Value/data). Remember to save your settings.
Share a screenshot of your resolvable Handshake domain in the Namer Community to earn the <Creator> role.