So I finally got around to adding photos to my profile, and now am getting a few messages. Here is my question: how do you deal with messages that are polite but you have no interest in pursuing the person? Am I supposed to just ignore them? Somehow let them know I received their message but am not interested? I don't know what to do and I don't want to be rude!

Clearly I am new to the online/dating game.

ETA: Thanks for the advice everyone! It feels so rude but per everyone's suggestions, I will just ignore them. This will definitely be an adventure...