Broken lcd screen. Hello. My phones lcd screen is broken but the phone still works. Ive been using

Question

Hello. My phones lcd screen is broken but the phone still works. Ive been using it for now until i can get myself a new one. The only problem is now my text message is at 100% full and so my phone is beeping and vibrating every 2 minutes, driving me crazy. I need to find a step by step guide or manual on how to delete messages. do you know of any sites that would be able to help me out with this? thank you,
serena