it doesn't matter if you are online or not... You have to fix your draftlist in the way you want , order your desirale players , and then on Monday (28 June) it will be done automatically. For example in your Division you will "choose" 7th (worst win-loss record chooses first and etc). I put "choose" in brackets because you will not actually press anything at that time. Just when it comes at your turn , the program will see your draftlist and if your first pick is available you will take it , else you will take your second , else your third and etc...
this is how it goes , so no you are not supposed to be online :)