When you first launch the app you are on the Map page by default, and you can always get back there by tapping on the leftmost button at the bottom of any page in the app. Pins on the map represent restaurants that have vegetarian or vegan meals near your current location. If you want to find meals at a different location, tap on the Search button at the top of the page, on the left side. There you can specify a different location, or enter specific words to search for (e.g., the name of a meal or restaurant).
If there aren't any pins on the map, that means that there haven't been any meals rated at restaurants near that location. If you know of some, help out the PlantEaters community by adding them!
Tap on the Add a Meal button at the bottom of any page (in the middle), select the restaurant from the list, and then enter your rating for the meal. That's it. Adding a photo with your rating would be great, but we all know how hard it is to remember to snap that photo before you're half-way done with the meal! Just skip the photo if you forgot to take one.
PlantEaters is a user-generated content site, which means we all need to help our fellow vegetarians and vegans by adding meatless meals whenever and wherever we find them.