Hi, TristanJ
Please refer to this LINK
https://support.huawei.com/enterprise/en/access-network/dn8245w-10-pid-21855395
1. Connect to the Wi-Fi network.
2. Open the computer browser and enter the gateway IP address (usually 192.168.1.1) of the nameplate on the back of the router. The gateway configuration page is displayed.
3. Access the DHCP client interface and view the host name. Record the IP address of the device whose network speed needs to be limited.
4. Choose Router Advanced > Bandwidth Control Settings. On the page that is displayed, enter the IP address range of the device whose network speed is to be limited, set the bandwidth limit, and click Enable.