The signal intensity will be present at any time in a tiny bar you can place anywhere in the screen. In that bar you' iew the bar and the numeric value.
If you can't access a website or your IM client is not connecting propely, have a look at the status bar ad check if the connection is strong enough.
If you right click the status bar, you'll access the settings menu to configure it.
Watch out wireless connection thanks to WiFi Sistr. It's easy and it doesn't consume a lot of resources.