go to the camera, there should be 3 dots next to 3 lines on the lower right corner. press it, and it will bring you to a page with all your friends on it. on the top right corner of the page will be a shape of a person and a + next to it. tap that, and go to the search button, and search your friends!
Start by opening the app and then clicking on the menu button in the right hand corner. Choose on the "Find Friends" option. This will bring up an overlay window. Choose on the Okay option and then select on the friends that you would like. Finish off by clicking on "Done."