the line you posted, "acl allowed_hosts src 192.168.10.0/255.255.255.0 should be replaced with your own", mean replace the 192.168.10.0 with your network. From your posting, it will be 10.x.y.0
acl allowed_hosts src 10.x.y.0/255.255.255.0
Of course you want to fully put your network, not the x.y. but the actual numbers.
If after changing that line in the squid config file, if you still aren't able to browse the web using the proxy, look at the logs to determine if your 'network' is being changed by another router somewhere between you and the proxy.
Let us know how this works out for you.