You can use a special tool in the Direct Admin panel to redirect users from a domain or a specific page to another URL.
To do this, select the "Account Manager" section in the panel, within which select "Site Redirection".
Then click on the "Create new redirect" button (as in the image below).
When a new window opens, in the first field, select which URL you want to create the redirect rule for. In the next field, select the redirection type and specify which URL to redirect to.
After completing the form, click the "Create" button.