How to change my A record?If you are a SiteGround customer, you can manage your domain's A records from your Customer Area > My Account Section > Manage.
Next to your hosting account, click on "Manage". Then you will be taken to a new page with various options. At the bottom of the page you will find "Manage A records". Click on it and you will be guided further into the A records management tool which includes all of your domains.
If you are not a SiteGround customer, you should be able to edit your A records from the control panel at your host/registrar. For more information on how to do this you will have to contact your host/registrar.