When you receive a DM from someone on Instagram, there are a few things you can do in order to respond. The first thing you should do is check to see if the person is following you. If they are, then reply back with a quick and friendly message. If the person isn’t following you, then it’s best to just ignore them. Some people like to follow people for the sake of following, but others may not be interested in hearing from you. Just because someone follows you doesn’t mean they will want to communicate with you. If the person has asked for your contact information, then reply back and give them your information. It’s always good to be polite and provide as much information as possible so that they can get in touch with you again. Finally, if all of these steps don’t work and the person still hasn’t responded after a few days or weeks, then it’s best to reach out to them directly through their Instagram account instead of waiting for a response from email or social media.