Creating a custom DNS entry to point to a server IP is simple and allows you to give out a name instead of an IP, which makes your server easier to remember.
1. Proceed to the "Domains" tab located within your webhosting control panel
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2. Where it says "Subdomain" enter any name you choose. (EX:Vent,TS3)
3. Where it says "Type" select "A" from the drop down box
4. Where it says "Where it points" enter the IP of your server. (do NOT use a port)
5. Click on "Submit changes"
You have now created a custom DNS entry for your server. Keep in mind that it can take some time for the IP to propagate.