I started blogging just before two weeks and bought a domain for blog. It is not a big task. I managed it within two hours and I am also not a tec expert. So I will explaint it here in simple words.
The first thing I am going to explain is that how to buy a domain. I am not telling you to how to choose a domain name because you already choosen your domain name before posting this question. So here is the deal. First go to any domain selling website. I prefer Bigrock.in, because I purchased my domain from this website which providing cheap rates for domains. I bought .in domain for just 230/- for one year. After the successful registration and payment now you can login to you account. You need to perform two settings in bigrock website. First of all go to DNS management page. There you can see buttons like A Record, CNAME, AAAA, like that. You only need A Record, and CNAME for setting you domain. First of all go for A Record. Delete all the records available in that page (there may be three A records). After deleting these records you need to create four new A Records. Here you dont have to fill a lot of things. Click on the A records any add new records. For setting A records you have to fill only one box. Leave "Host Name" and fill "Destination IPv4 Address" field with 126.96.36.199 . Your first A record is ready. Then you have to create three more records. Just like the first one you have to fill only the destination Ip address. They are 188.8.131.52, 184.108.40.206 and 220.127.116.11.
Now your A Record is cleare. Now go for CNAME. Delete all CNAME's if any. Click on add new CNAME. In the add CNAME page write 'www' in the "Host name". In the "Value" select the second radio button and write ghs.google.com in the respective field. Thats all you dont have to edit or fill any other boxes in that. Then click on submit button. Then you need to create a second CNAME. Its also like the first one but the values are different. For getting Host name and Value you need to login in to your blog, go to settings>basic, and under the publishing you can see an option 'Add a custom domain'. Click on that link. Enter you domain that you bought. It will show an error and it will ask you to see the "Settings instructions". Buy clicking this link you can find your second CNAME. When clicking on the above link it will show leave page/ stay on this page option. Click on the leave page. From this page you will get your CNAME records. The smaller token is for the Host Name and the longer token name is for Value. Just fill both these value as inserted in the first CNAME. Now the work with your domain registrar is done. Now go to blogger, choose add a custom domain option, and save the settings. If it is showing error save it after one or two hours. After the successful saving of your domain you can visit your website with the custom domain within two hours (in normal case).
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