To update training. Locate the user needed by going to their profile using the Manage badge or the People Powerbar. Once there, click on the Training tab as shown below.
Select the "Add Training" link. If you don't see this link (located at the top right side of the Training tab) then you don't have these privileges and should contact your scout leader.
After link is selected, the following form will appear. Fill it out and save.
That's it! You've just added training.