Unsecured network with WiFi

I changed the network name and password for finity app. However, when I connect to WiFi on my iPhone, it doesn't ask for a password and shows up as an unsecured network. It looks like free WiFi and there is no lock mark. How can I require a password to connect to WiFi? Also, when I connect to WiFi, it cuts out after a few minutes and is very unstable.

How can it be improved?