I want to edit the background of photos using lightroom how can I do that? If not can i access photoshop for mobile with the same subscription, how can i use it? Please help
You have to explain what you want in a bit more detail. Lightroom cannot work with layers, but depending on what you want to do, it may still be possible to do it in Lightroom. Photoshop for iOS does not exist yet, but there are some other Adobe apps that can do parts of what Photoshop can do. You may have to export your photo from Lightroom to the Camera Roll to make it available for such an app.
Try Photoshop Mix: https://play.google.com/store/apps/details?id=com.adobe.photoshopmix for removing/changing backgrounds