How to use tumblr app for the iPhone 4?

I just got all this stuff and I have no freaking clue how to use it! Someone please help me! How do I get to settings and reply to things?

Tumblr has updated their mobile app for any mobile device immensely and well it's gonna keep changing I guess, but to be honest if you've already thought of a theme for your blog that's great! I'd suggest actually picking a theme and make your blog look nice, but you'd have to do that on a computer. After that since you're using an iPhone, reblogging, liking, and posting photos, quotes, and etc shouldn't be a problem. At the bottom for the current and newly updating Tumblr app, there should be your dashboard, the tags and blog search bar, and finally your notifications, where your blog will show up. When you're on your dashboard and you find a picture you like simply click on the reblog button to reblog it to your blog, or you can press down on the reblog button for about 30 seconds and reblog it manually. The like button is right next to it. If you want to message someone, simply click on their blog, and ask them anything! You can choose if you want it to be anonymous or not. Posting anything isn't difficult, simply click the bottom right hand corner to post what you please. The only thing you can't post is audio unlike on a computer. If you're referring to your Ask Box you can only enable it on an actual computer. It's impossible for you to do it on an iPhone.