Making a new email address - help

Making a new email address - help

Hello,
This may be a stupid question but I don't know how to make an email address.
I had a previous account which I haven't used in years, linked to my main personal account. I have logged in and purchased 2 domains as I'm torn on a business name. I want to set them up with their own respective email addresses. I cant figure out how. I see no option to make a new email address anywhere, but as I understood it you can have multiple through one log in. 
Both domains are linked and set up with MX, SPF and DKIM. 
I just need to know how to make a new name@business1, and name@business2 with their own inbox.