How to replace videos in sqlite database using xcode [on hold]

i am working on xcode project. The project is already made from someone else i only have to change the content in the database. but i dont have any idea how to do this i never work with xcode. so please help me how to solve the problem. in my project there are some videos and i need to replace those videos. the videos are stored in sqlite database. so for instance if i clike on video one its playing video one but i need to change this video and replace with new one. any idea thanks in advance