Whatever you do, don't do a factory reset to "fix things." Without the remote, you're screwed. The app is useless if you factory reset, or reset the network. Or change your network password. Or... heck, find the remote as soon as you can, or order another. You'll need it eventually.
DBDukes http://www.dbdukes.com/Roku Ultra (4660) Roku Premiere+ (3921)