Check the Domains FAQ if you don't find what you're looking for.
To migrate your mail accounts to Office 365, you need to create a DNS record at your domain registrar.
If you purchased your domain through Google while signing up for your Google Apps for Work account, your DNS records are managed by Google but registered with GoDaddy.
You can access GoDaddy, and create DNS, through the Google Domains page. Just follow the steps in this article. (Need more help? Get support.)
Create the DNS record
At the Google Admin console, choose Sign In.
Enter your domain name, and then choose Go.
At the bottom of the page, choose More controls.
On the Domains page, choose Add/remove domains.
On the Domains page, choose Advanced DNS settings.
Note: If you didn’t purchase a domain name through Google while signing up for your Google Apps for Work account, you won’t have Advanced DNS settings on your Domains page. Instead, you must go directly to your domain host’s web site to access your DNS settings and to perform this and the following steps. See Access DNS records from a partner host for more information.
On the Advanced DNS settings page, choose Sign in to DNS Console. Note the Sign-in name and Password information. You'll need it in the next step.
Log in to the Google Domain Manager using the Sign-in name and Password from the Advanced DNS settings page.
On the Domains page, choose your domain_name.
On the Domain Details page, choose the DNS Zone File tab, and then choose Add Record.
On the Add Zone Record page, in the boxes for the new record, type or copy and paste the following values.
Paste in the Destination or Points to Address value.
Choose Save Changes.
Note: Typically it takes about 15 minutes for DNS changes to take effect. However, it can occasionally take longer for a change you've made to update across the Internet's DNS system. If you’re having trouble with mail flow or other issues after adding DNS records, see Troubleshoot issues after changing your domain name or DNS records.