Did you install Fomo via the Ecwid app store?
This means you have a fully functional Fomo account. If you'd like, you can access your Fomo account directly now by going directly to https://fomo.com.
If this is the first time you've accessed your Fomo account directly, you can create a password by submitting your email (the same one you use for your Ecwid account) here.
After setting up your Fomo account, you can further customize your Ecwid integration here.