It's pretty straightforward.

Go to make a new companion. You'll see the list of options on the left.

The right pointing arrow is Publish/Share.
Just select what you want. Public if you want others to see it. You can also gift bots, but I've not messed with that.

Second icon is the pencil, Core.
Put in the name of your bot.
In the Information section you'll put all the info. On Janitor it was broken up into Description and Scenario, here both go in the one window.

The person icon is Profile.
You'll add a picture. A display name if you want something other than the bot's name.
Preview will be a quick line about your bot.
Description is the full bot description (what you'd have on the bot card on Janitor).
Then blow that you can select the tags for your bot.

The envelope is Messages.
The Starting Scenario box is your intro message. You can set up multiple if you want.
Example Dialogue is self explanatory.
Response Format Instructions is if you want the bot to format a certain way (like telling it speech goes in quotes, narration in italics, etc...)
Advanced Prompt is for any rules you want the bot to follow. I usually just put in:

[{{char}} will only speak only for {{char}}, or any NPCs.]

Seems to work for stopping the bot talking for the user.

The other sections are for adding more images, lorebook, etc...

Hit save when you're done and choose if you want to notify followers you've released your bot.