Go to NetEarthOne, Settings > API enter your IPs which your blesta is on.
Go to the Modules page on Blesta, click LogicBoxes.
Create a reseller connection ID: you get it from NEO, and the API Key is from the API page on NEO.
Then go to the packages create one.
Module: Logicboxes, select the one you want, then click the box next to the domain for the tld you want.
Then make a order form, domain and other and save.