What you should do is enter the cPanel
In the Domain option, select Redirect and then in add redirection select the type of permanent redirect (301) or temporary (302)
In the second box you can leave by default
In the third it is left blank if you want to redirect from the root of the main domain or add a word if the redirect is from a sub folder.
In the fourth and last table we add the final address to where the redirection should be.