You have two broadcast modes.

One is Keymaps (your groups of mapped keys).
The other is Repeater (or Broadcast; it was called one initially, but is now called the other).

You have two clickbar images at the top of the screen, assuming you used the Wizard to generate the team and let it create those for you.

The one that shows A > A, is Repeater.
The one that shows A > Something else is Keymaps.

The wizard has generated several mapped keys, which work when Keymaps are enabled.
These include the Assist Keys: 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, -, and =.

By default you don't have Enter as a mapped key.
It is extremely easy to create additional mapped keys.
You can check out the video by MiRai on how to do that; you can find it on the IS Boxer site.
You could also check out the guide in my signature; the Keymap section will illustrate (initially assuming you know absolutely nothing about IS Boxer) how to make mapped keys and such... they build on previous examples.
Most of the stuff there, is done for you via the wizard, but the examples (if you do them, even if you delete them afterwards) will teach you how the interface works, so you'll be comfortable adding your own mapped keys or more able to follow someone helping you out in the IRC (on the IS Boxer site).