One of the app's most interesting features lets you filter campaigns by category. This means you can check out only projects about gaming, about comics, about animals, etc.
Once you've found a project of interest, just check out the different levels of support available and pledge money if you're into the idea. You can also change your level of support before the campaign ends, and obviously also ask the campaigners questions about the project or simply leave them your comments.
Indiegogo is a brilliant alternative to Kickstarter, with way more interesting projects. The app design also makes all its features particularly smooth to use.
Requires Android 4.1 or higher.