Is there anyway to active the assignment rules for the leads?

I have no problem to insert leads by using the tool kits, but all the leads have been stay into the login account instead of being distributed. Is there any way I can do via the API?

Is there anyway to active the assignment rules for the leads?

I have no problem to insert leads by using the tool kits, but all the leads have been stay into the login account instead of being distributed. Is there any way I can do via the API?