Choosing offline accounts when registering with student/home license

Registering Student/home license takes two accounts off-line. How can I change that to the two accounts of my choice? Properties context menu for In-box does only gives static information with no option for selecting on-line or off-line. More information is appreciated. I’m using eM Client 2.6.7096. Thank you!

Open Tools->Accounts and for every account there is a checkbox on the bottom with text Enable account, so uncheck this for accounts you won’t use.
Alternatively in the same window you can change account order by clicking on button with up and down arrow.