If it's your first time connecting your wallet on Mirror, you'll be able to set your project settings like the display name, profile photo, accent color, and more.
You can also link your ENS account so your entries are hosted at "https://mirror.xyz/<your-ens-name.eth>/<entry-digest>".
You can even link your Twitter account so your Twitter profile is displayed when you engage with content on Mirror. However, linking ENS and Twitter is not required so you can still publish on Mirror without it.
Once you've finished setting up your account, you can click "Create My Mirror" which should redirect you to your dashboard.
Congrats, now you're ready to publish your first entry! One final note, you may notice the "+" icon in the lefthand sidebar of the dashboard. If you receive a $WRITE token, you can click the "+" icon to register your custom subdomain.