Simple NAT + Wan Limit

Hello,

I have simple NAT on Mikrotik Routerboard 450G in my office with 1 wan. we have aerial Fiber 4 MB and there is no bandwidth restriction on any user but our ISP recommended to restrict/limit the wan to 3.9MB.
but how can i do this. HELP

Arman

http://wiki.mikrotik.com/wiki/Manual:Queue#Simple_Queues
If you need more specific help post specific details regarding your setup, at least interface names and IP addresses on the interfaces.

Thank you Fewi