STEP 1 : Login to Direct Admin ( Guide here ). Make sure your access level is on Reseller ( Top Right )

STEP 2 : Navigate to Account Manager -> Manage User Packages. Click on Manage User Packages

STEP 3 : Click on Add Package ( Top Right Corner )

STEP 4 : You will see a row of features which it allow you to set the limit for each features in the hosting account. Set them up according to your interest. Click on save at the end

Upon completion, you will able to see the packages under Account Manager -> Manage User Packages