When you go in the settings and put WiFi ON it can take a while for the device to detect the availeble WiFi networks.
You'll see a small WiFi (enty) icon on the top bar, then once it has the network it will fill-up.
Otherwise no specific things needed.
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Above, WiFi is ON, but it is still searching.
Above, WiFi is ON, and connected.
If needed, click on WiFi; the text WiFi (not the on-off button), then click "ON" and a list with the available WiFi networks will appear. Select the correct one and enter (if any) your security settings.
You can press the circle arrows (at the Red arrow in pic above) to Refresh, so your AK100 searches again for available networks.
Hope this can help,
Casper