How to erase text messagegs from LG-VX11000 my internal screen is broken and touch don't work!?!

I am to reply to text messages if my inbox wasn't full. My touch screen doesn't work but I can see messages and reply immediately but since my inbox is full I'm unable to see my messages and I MUST CLEAR MY INBOX. This phone is the LG-VX11000 please give clear instructions so that I am able to erase messages as I open them.