Log into http://my.scouting.org. In the upper left corner click on menu and then select Manage Member ID. Make sure that the Member ID you want is there and if it isn’t, ADD it. If it is for your primary position(s) make sure to set it as PRIMARY.
Then log out of my.scouting.org
You can then use your my.scouting.org login and password to access my.Scouting.org, the forums, Internet Advancement and Scoutbook.