fusion 360 How do i edit premade files?

FOR example the parts for openbuild, i open them, see them just fine but for some reason i can't do any of the modeling stuff to it?

but, i can create stuff and model it just fine, its as if i can't really touch the golden color stuff, when i create its kind of grey.

also side not, how do i add/edit the 'number of starts' when making threads/acme rods/holes
i just see a generic acme button but nothing for number of starts? How?