Replaced with your own domain name of course with different considerations, depending on needs, your blog will look professional.
If the traffic or visit to the old blog address is good, with changing to new domains will decrease quite dramatically, but do not worry because when someone entering to your old blog address, then will be redirected / forwarded to the new domain address, so do not worry will lose old visitors, and the visit traffic will increase again.
If you want to change your blogspot address, first you must have a domain name by buying ( actually rent) domain name you want.
To buy a domain is not difficult, many providers, you can search on the internet. Simply, we just need a domain name, without hosting, because for hosting / storage, still using Blogger, it is very advantageous because we do not need to think about hosting and bandwidth (unlike when we use paid hosting, bandwidth depends to price)
If you already have a domain name and want to change your blogspot address,
From Domain provider, you will get a login to get access to the Domain Registration Service for your Domain name, where there is a setting DNS (Domain Name System), which will be set to make your domain name in order to connect to Blogger
That need to be set are CNAME Records and A Records.
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