Go to options>filters>hosts and see if the ip is listed there. if not paste or type it in, click apply and ok and it should be blocked. It is possible you need to restart LW for the block to take effect ( I forget)... Also note that you must NOT enter the port number .. the numbers after the colon (
I hope that helps ... also be aware that some hosts ips can change with time .. and please dont publish ip nos as it is against forum rules ..how ever much you dislike them
If you could edit it , it would be good