i want to create trigger on attachment object  , but i am not able to find it in setup. can anybody suggest way how to do it?

i am assuming it from Developer console?

Thanks in Advance.

I want to create trigger on the Attachment object, but am not able to find it in setup. Can anybody suggest how to do it?

I am assuming it can be done from Developer console, but I am not sure of the correct steps to take.