You will want to add an A-record for your root domain (mydomain.com)
And if you want to get fancy, also add a CNAME (www.mydomain.com) subdomain
There are two steps, and GoDaddy has hard-to-find articles. Reposting text here:
ADD AN A RECORD
An A (host) record connects your domain name to your IP address. A records let users enter your domain name in a Web browser to access your website. They are the most common type of zone record.
Follow the directions to access the DNS Manager.
Click Add Record.
From the Record type list, select A (Host).
Complete the following fields: Host Name — Enter the host name the A record links to. Type @ to point the record directly to your domain name, including the www.
Points to IP Address — Enter the IP address your domain name uses for this host record.
TTL — Select how long the server should cache the information. Click OK, then click Save Zone File. The new A record displays in the A (Host) section.
A CNAME (Alias) record points to an A (Host) record. You can create multiple CNAME records and point them to an A record. The most common CNAME records are the subdomains www and ftp.
CNAME records make your DNS data easier to manage. If you change the IP address of an A record, all CNAME records pointed to that A record automatically follow the new IP address. The alternative solution, multiple A records, is not as simple as using CNAME records.
Follow the directions to access the DNS Manager.
Click Add Record.
From the Record type list, select CNAME (Alias).
Complete the following fields: Enter an Alias Name — Enter the subdomain name for the alias assignment. For example, type www. Points to Host Name — Enter the host name you want the alias to point to. For example, type @ to map the alias directly to your domain name.
TTL — Select how long the server should cache the information.
Click OK, then click Save Zone File.
You can click Restore Defaults in the CNAME (Alias) section of the Zone File Editor to restore the default CNAME records for your domain name.
在上图中的TTL是指TIME TO LEVEL，表示DNS记录在DNS服务器的缓存时间，是为加快域名解析速度而设置，默认设置即可，也不要太长，如果设置10小时，如果期间修改了IP地址，很可能需要等待几个小时或更长时间，DNS状态才能得到刷新，影响使用。
5、添加CNAME别名
CNAME别名设置方法类似于A记录设置，比如要设置http://ftp.jb51.net，则只需要在Alias Name中填写ftp，Points to Host Name中填写别名地址即可，很多虚拟主机商一般都会在主机设置里同时提供IP和CNAME名，用户只需要根据实际情况，设置一个生效即可，比如要设置http://ftp.jb51.net到别名user1234.xxx.com，则只需要在Points to Host Name中添加user1234.xxx.com即可（在有些面板中可能最后还需要加个.号，有些会自动添加，这里就需要注意一下是否需要添加），下图中Points to Host Name值是@表示CNAME到默认的顶级域名地址（系统自动增加），只是个约定。
这里如果要增加feed子域名，只需在上图中的Enter an Alias Name里输入feed，下面的Points to Host Name设置指向主机名，比如mydomain.feedsky.com，然后点击确认即可。
二、国内域名解析设置
1、国内域名控制面板
如果您的是国内域名，其设置方法跟上文类似，只是语言不同而已，国内一般的域名控制面板都类似下图：
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