Please give me some more info. What iOS device are you using? What version of Remoter? iOS device firmware version? Machine you're connecting to: OS/VNC Server type. Anything else that might be non-standard. Thanks,
Make sure your VNC server is not set on view-only mode. It's called different things depending on the VNC server you're using. I have not experienced this problem myself, and don't know how to recreate it, other than by setting the server in view-only mode. Does typing work?