Check out the ie mod thread....also, search out console commands for another thread about the AddAbility command.
I wound use using the ie mod respec command, but you might just be able to try this:
"~" to bring up console
"iroll20s" to enable console commands, you will lose achievements if that matters to you
"FindCharacter x" where's is your player char name, it will probably display something like "Player_New_Game(Clone)_3
"AddAbility x distant advantage" where x is that player_new etc string
This will probably only work if you are not seeing Distant Advantage anywhere on the char sheet, rather than just not on the Active Effects area...