You can setup the direction from www to the main domain by following the step by step below:

Then click File manager.

Now, you have to click on the file name .htaccess to edit and add the code below:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.yourdomain.com [NC]
RewriteRule ^(.*)$ https://yourdomain.com/$1 [L,R=301]

Then it is time to add CNAME for www for your domain in your DNS provider, If you have integrated CloudFlare on CloudStick, you can go to main dashboard page of CloudStick, then click on DNS and then you can manage the CloudFlare DNS for any of your domains.

Then click on the domain name and add CNAME record as you see in the screenshot below:

Next step is to attach the www to the website. If you have added www already then you can skip this step. For this click on Total Websites and click on the website name.

Now, click on Domains names and add www.domain.com and click on Attach Domains.

If you have already installed SSL without adding WWW. Highly recommended to remove SSL and install SSL once again.