how to do you hide bullets in Keynote?

bullet symbols have nothing to do with controling builds

to use text in a build sequence:

create individual text boxes

select all

Inspector > build

set up build effect

delivery by paragraph

open the side drawer to arrange the build order if necessary

Gary Scotland is right. You do not need to have bullets to have actions in keynote, but if you dont want to remove each bullet into its own text box (its easier to keep everything aligned) and still have your actions apply that you already set do the following:

select your text and in your Text inspector (The big T), select the bullets tab. You can select no bullets in the drop down menu. Make sure that in your Build inspector (the yellow diamond) tab you select "delivery by paragraph". Once that is selected there is a check box "set timing and order for each build" and select that. You can now create seperate timing and for each paragraph in your build.