If the Wireless section isn't showing, it means that OSMC doesn't have the driver for your WiFi dongle or it doesn't identify the device as compatible with existing WiFi modules.
RTL8192EU is a very rare WiFi chipset and only appears to be in a few dongles. There is no driver for it in OSMC currently.
You could look at this source: https://github.com/jpostma/rtl8192eu. It would need a couple of fixes to build it against 4.4, but these can be found for other Realtek drivers.
The driver seems a bit neglected, but I will see if we can add support for this dongle in the future. Unfortunately this is one of the few WiFi chipsets I don't have, which makes it hard to test.