While we will soon add one-button-functionality for sharing. In the meanwhile, once you have created a party on the new platform, you can share it with your co-hosts by sending them your code.
To do that, just click to copy the code of a link party,
paste the code as a plain text (we usually use the https://pastebin.com/ to share codes) and then send it to them.
In case you want them only to add their links and not to add your party on their blogs, you can just send them the unique link of the party you will find at the bottom of the same code window: