How to select Wi-Fi access point? I am at the hotel trying to get my stuff connected. Had no problems with phone and laptop, but when I'm connecting with the tablet internet is unavailable. 

As far as I can see, it's connecting to some other access point and is being put to other subnetwork (see screenshots, the phone and the tablet). I tried different places, different floors - it's all the same - WiFi level is OK, different subnetwork, no internet. 

Is there any way I can fix it by myself, while waiting for hotel staff to "call the programmer to reboot it"? (other than installing Connectify, which I've already done).
First remove the network from known list. Then when you're adding that Wi-Fi network on your tablet use manual DHCP and enter the details from your phone...

This should work without issues..