As discussed here, website redirects are used to point one domain to another.
If you would like to edit a website redirection on your 123-reg hosting package, please do the following:
Login to your 123-reg control panel.
Scroll down to the Web Hosting section.
Select the relevant domain name from the drop down box and click on the Manage button.
Click on the Website Redirect option in the Web Tools section.
In the Edit Website Redirect from field enter the directory that you wish to edit and press the Modify Redirect button.
This will then populate the create section where you can edit the Website to Redirect to field or change the redirection type., then press the Create Redirect button to complete the Website Redirection edit.
If you need to remove the redirect click on the Delete Redirect button.