I have a domain of a provider and a vps of dogitalocean.How i connect my domain to my vps?

Hi i have my own domain that I buy (ownhosting.eu).I have add the domain in the DNS section. In my vps i have installes cPanel & WHM. I add my hostname into the setup of WHM. I’ve created a cPanel account for me.I create some sub domains and I put the domain redirection to my vps ip.When I type for example dev.ownhosting.eu it say this error: ERR_NAME_NOT_RESOLVED I’ve create this sub domain also in the domain controller of my provider but anyway don’t work. This is my zone file : $ORIGIN ownhosting.eu. $TTL 1800 ownhosting.eu. IN SOA ns1.digitalocean.com. hostmaster.ownhosting.eu. 1440779151 10800 3600 604800 1800 ownhosting.eu. 1800 IN NS ns1.digitalocean.com. ownhosting.eu. 1800 IN NS ns2.digitalocean.com. ownhosting.eu. 1800 IN NS ns3.digitalocean.com. ownhosting.eu. 1800 IN A 104.236.71.143 info.ownhosting.eu. 1800 IN CNAME ownhosting.eu. dev.ownhosting.eu. 1800 IN CNAME ownhosting.eu. downlaod.ownhosting.eu. 1800 IN CNAME ownhosting.eu. forum.ownhosting.eu 1800 IN CNAME ownhosting.eu I think that is not a problem of the zone file but a problem of cPanel or a problem of my provider. Anyway when i type my Ip : http://104.236.71.143/dev (dev is the folde that contain the index.php) it says this error:

Not Found The requested URL /dev was not found on this server. Apache/2.4.16 (Unix) OpenSSL/1.0.1e-fips mod_bwlimited/1.4 Server at 104.236.71.143 Port 80 Is it a problem of Apache?I have read the file .htaccess but i think is Ok.

My .htaccess of dev.ownhosting.eu:

RewriteEngine on RewriteCond %{HTTP_HOST} ^dev.ownhosting.eu$ [OR] RewriteCond %{HTTP_HOST} ^www.dev.ownhosting.eu$ RewriteRule ^/?$ “http://104.236.71.143/dev” [R=301,L]

What i can do?