That is a rather uncommon request indeed.
Given that Ubuntu has a lot of configuring and info-displaying tools, let's try to stay away from the command line for now
What I would do, is plug in the USB device, then open whatever Ubuntu calls the "Information Center" or "System Info" and look in the USB department to locate some sign that the computer sees the device connected.
Next I would try the device and see if it works as expected. If it does, great! If not, read on..
From the information center, determine which USB port the device is connected to.
Now, using your filemanager (Nautilus??) as root (type 'sudo nautilus' in a console if necessary) navigate to the /dev folder, and see if you can identify the 'usbdev' or similar, which corresponds to the USB port in use, or to the device itself.
If you see it, right click it and change its properties/permissions such that your user account has the necessary access permission. Now try using the device again.
If this help is wrong, confusing, or not working for you, please post for us (or in the Ubuntu forum) the README instructions, as well as the output of the console command "sudo lsusb" entered with the device connected and turned on (if 'turned on' is relevant for a watch
Good luck-- I hope this gets you started, and/or that someone else can help further, particularly if there are weird rules or auto-mounting stuff that needs to be configured. In that case, an experienced Ubuntu user should have a much better idea what to do than I have presented here!