You can't add multiple signals to a single Signaler account. Each signal requires its own separate Signaler account.
What you need to do:
To offer a new signal, you need to create a new signaler account and apply to become a Signaler again with that account. In your application, include the username of your current Signaler account so we can verify and approve you faster. Once approved, you can set up your new signal on the new account.
Important to know:
One signal per account is the limit
You can apply through this link