To add a new character to your program,
tap on the plus sign in the character area.
Scroll down through the characters,
and tap on the one you want.
Tap the check mark to select that character.
The character will appear in the center of the stage.
Drag the character to position it
where you want it to be.
The blocks that you drag to the program area
will affect only the current character.
If you start every character's script
with a green flag,
they will all run at the same time:
when you tap the green flag at the top of the screen.
To delete a character,
press and hold it, either on the stage,
or in the character area,
until you see a red X on it, and then tap on the X.
Note that when you delete a character,
you also delete its scripts.
If you have deleted all of your characters,
the block palette will disappear as well,
since all scripts are attached to characters.