Must be in the QoS section on the left hand side to limit speed with said made class, otherwise put in FW section on the left hand side to accept, drop, reject the connection.
Since in routed-mode, You can try to use just the src and dst ips in the classifier, and leave out the in/out interfaces. (Not sure though?, play around with it)
Also make sure the class that is made for the speed, is assigned to the appropriate interface in the Class Interface Manager, otherwise is won’t shape at all. The download speed/class is what the LAN-side interface is, and the upload speed/class is the WAN/Internet-side interface
And always remember to apply/save changes.