Sorry, i misread that. I don't see any documentation on the Network Solutions site about Pear mail, so I cant really say for certain what the path to pear would be on their servers.
I know you say you have already asked their support, but they weren't very helpful, but if anybody will know what the path to pear on a network solutions hosted account is, it would be network solutions support
Through google i found a thread in their forums that seems to hint the path is:
But i have no way to verify this.