To create and check an email forwarder or redirection through cPanel you need to access the panel and go to Forwarders under Email:
There you will see already created email forwarders and will also be able to create a new one by selecting Add Forwarder:
There you will be presented with the Add New Forwarder section. Specify the email username that will be forwarded in the Adress to Forward (without adding the domain name), fill in the full destination email address and click on Add Forwarder:
Once done - the newly added forwarder will be shown on the Forwarders page:
That's it! Now you know how to create forwarders on cPanel!