Poptropica has no bar to brace, but you can costumize braces and press the space bar to do certain things in certain parts of some islands, like throw ninja stars on Red Dragon Island.
using the space bar.
In the ballroom
by pressing space bar
you press on the space bar;]
space bar
by collecting the fuel gauge bar
Press the space bar
about 50
Press the space bar! (while you are holding it).
you click space bar
press the space bar
use the space bar :)