McCreed, are you Portuguese, or did you used a translator?
Not Portuguese, used google! But I took Espanol in high school! (I know they're not the same, but share some similarities).

I've been reading the manual. At the "Fitting the Bridge/Tailpiece" topic:

"Don't press in the threaded inserts yet. Instead wrap either multiple layers of masking tape or some plastic tubing around the posts and push them into the post holes in the body. We aren't going for a precision fit, just something to hold them in place while we do some measuring"

All kits came with the bridge holes drilled, so what should I do in this step?
Just as it says above, this is to temporarily fit the bridge & tailpiece so you can do things like set the neck to correct scale length position; align the neck with the E strings on, etc. before gluing.
The trick with set-neck builds is you only get one chance to get it right (and a limited time for adjustment once glue hits wood) so triple checking everything is important.