1. Log in to your Google Domains account.
2. Click on Manage next to your domain name.
3. Then click on DNS in the left sidebar.​
4. Scroll all the way down to a section called Custom Records, or Custom Resource Records, and click on "create new record."

Fill out out like this screenshot:

Leave the Host name field blank, choose A in the dropdown menu, leave the TTL field as-is, and in the Data field type: 109.105.219.109

Then click "Save."
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5. Next, click on "create new record" one more time.

For this record, type www in the Host name field, choose CNAME in the dropdown menu, leave the TTL field as-is, and in the Data field type custom.zarlasites.com and click "Save."

6. Lastly, if you see any other A records that exist besides the A record you just created, please delete those records. You only need a single A record, and it should be pointing to 109.105.219.109
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Once you've finished all those steps, please let us know and we'll check that it is all pointed correctly and set your domain live.