There variety of reasons that can prevent you from connecting. Here are some things you can try:
As a generall rule - if the device cannot connect to any network, either wired or wireless then it will enable it's access point mode and will be availabe to accept connections that way.
When the iGateMini is connected to a network and obtains an IP address, it will flash the IP address on the status LED
Try to connect in a browser with http://igatemini.local or http://IPADDRESS where IPADDRESS is the IP that is flashing on the status LED. (the easier "igatemini.local" name may not work on all networks)
The phone or computer that you are using to connect to the iGateMini must be one the same network as the iGateMini. For example if your iGateMini is connected to your home network, then your phone must also be connected to your home network.
The iGateMini saves WiFi networks that it has connected to in the past. If it can see both networks it will randomly connect to one of them. Saved networks can be 'forgotten' in the Network Settings page.