As we all know that Godady is one of the most popular site for buying domains and web hostings.
if you have bought any domain name at godady and you don't know how to map godady domain (.com or something) then you are in right place to solve your problem by following below steps.
Mapping Godady Domain (.com, .net, etc...) to Blogger (Blogspot) Account.
Login to your Godady Account :
Click On Manage Connection as shown in below screenshot :
Then it will open Domain Details Like Below Screenshot :
Click on DNS ZONE FILE as shown in Above Image.
Now Click on Add Record
And Select Record Type as A (Host), enter the 4 IP addresses as below, one-by-one,
using the Quick Add Record button.
Now Open Blogger.com Login with your Gmail ID and Password >> Click on settings >> Basics :
Copy the given two CNames as shown in below image :
After copying Two CNames go to Godady DNS ZONE FILE and Click On ADD Record and select record type as CName (Alias)
Paste the Two CNames Like Below ..
HOST : www
Points to : ghs.google.com
Second CName is also Same Like Above Hint.
Click On SAVE Records..That's IT
Now you can successfully change the Existing [mydomain.blogspot.com to mydomain.com] on your blogger account.