Accounts on mylearning.powerschool.com are completely separate from those in what we call School & District Accounts (yourdomain.myhaikuclass.com for example). So you'll need to create new accounts (either via import or using the web interface) for any teachers that you want to have access to yourdomain.myhaikuclass.com. 

If they already have classes on mylearning.powerschool.com that they want copied over to the your domain please contact us with their usernames & we can take care of that. In the end, those teachers will have two accounts & it's up to them to decide whether they want to keep their mylearning.powerschool.com account for personal use or not.