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Looks like the UPnP options don't show in that router model with some firmware versions.
Just 2 threads I found, you can Google for more info:
https://forums.qwest.com/qwbb/board/...&thread.id=983
Re: Trying to enable UPnP on an Actiontec GT701-WG Router - PlayStation®3 Media - PlayStation.com Forums

So assume that UPnP is already enabled in your router... did you change LW's listening port? Change listening port > click ok. Restart LW.

Before you set up port forwarding, you'll first need to set up a static IP address. Check this link for your info: PortForward.com - Free Help Setting up Your Router or Firewall

Then the port forwarding instructions for your router are here: Port Forwarding Limewire on the Actiontec GT701-WG
LW's listening port, port in the 'manual port forward' box & port forwarded within router configuration must all be the same number.

If you're still stuck after port forwarding, try one of those other apps & see whether you can connect.

It's always best to try the free version of a program before paying for it