To create a new identity, please click on Tools > Identities > New Identity.
Set up your identity with the same email address or a different one.
Please note: The new identity name should be different than your original Identity. Also, as everything is being done in the new identity, none of the data and settings in your original identity should be affected.
To switch back to your original identity, simply click on Tools > Switch Identity, select the appropriate identity, and click on OK.