Just to confirm that I understand correctly.
You have BT Infinity which is supposedly connecting as 37Mb... yet you are having problems streaming and it seems slow both on both wireless and Ethernet.
---
First of all do a
BTw Performance Test. Once you have done the speed test bit, click the "Further Diagnostics" button. What do the results on that page tell you? It should give you your IP profile so we can roughly work out your connection speed.
>> how can get on the router page
By default BT have locked all the BT modems down
However, theres is a way around this if you have a Huawei modem (or you can pick one up cheap on ebay). Everything you need to know is on
this page.