Forgive me for copy-pasting what I wrote in a previous thread, but I feel the information hasn't changed:

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I've only been using the app for a short time, but here are my instructions:

1. Download the app.
2. Put up as much information as you're willing to give (height/weight/age). I put more information up because I like people that are comfortable enough to put theirs up as well.
3. Put up a message that either reveals something about your personality or explains your intentions (are you looking only for friends, looking to hook-up, what kind of guys you're interested in).
4. Choose an image for your profile. People respond a lot more to a picture that shows your face, regardless if you're looking for sex or just to chat.
5. Wait for people to message you or be proactive and message others.
6. Profit

Now here are my findings/advice:

1. Most people are genuinely nice. The number of people I've had easy-going conversations with far outweigh the creeps.
2. People lie about their age/stats all the time, though it's usually just a fudging of the numbers. Don't feel bad asking for more pics to get a better idea of what the person looks like. If you only get 1 type of picture (all face pics, all pics posed in the same way), that's generally a sign that they're hiding something.
3. Always establish people's intentions. Some are looking just for sex, some are looking for friends, and some are looking for relationships. Most people want to just connect (not necessarily sexually) with other gay guys in their area, and apps like grindr help with that. But if your intentions don't match up with a guy, then it's fine to let him know and stop a conversation, since it'll be better for both parties.
4. Don't feel bad if people don't message back. There are many different reasons someone won't message back: they're busy/working, they only log in on the weekends, they're talking to someone else, they set their phone down to do something else. Them not liking you is only one of the many many reasons they might not respond (and frankly, it's better they don't respond than to try to be nice and end up stringing you along).
5. Conversations can turn NSFW very very fast. Don't use the app if you get offended by questions/comments of a sexual nature (even if you're not looking for that).
6. YOU ARE NEVER OBLIGATED TO MEET ANYONE. Do what makes you comfortable. If anyone makes you feel uncomfortable, block them. That's what the button is for.

I can go on, but this is a book now. PM if you have any other questions. I've only used the app for a short time but I have made friends with guys online and have met guys off of it with varying success.