In order to redirect users to this page when a 404 error is triggered you have to enter a short line of code in your htaccess file.
Step 1
Enter the general sattings of this stack page and make sure your folder name is set to 404 and the Filename to index.php
Step 2
Open the Publishing tab of your Rapidweaver project and click in the Edit .htaccess file button.
Step 3
Enter the following line of code and press Save and Upload to update your .htaccess file. You are done!
ErrorDocument 404 /404/index.php
Step 4
Test your 404 page by entering a URL path in your browser that you know does not exist in your domain.
For istance
https://your-domain.com/page-that-doesnt-exist