First of all, plug your wireless router into your internet modem. The router may have a separate power button. Make sure it is switched on.
Always place your Wifi router near the area you want to use internet from. It allows you have strong signals. If you are still getting weak signals, go even closer to the router. A few cheap routers give weak signals anyway. Connect your laptop/mobile to Wifi, and start using it.
Once the router is accurately installed, you need to change your settings. Go to the web and setup your security name and password in order to stop others from using your Wifi. Most of the internet providers offer a special web address from where you can change your settings.
After finishing with the configurations and password, test the connection more than once. Disconnect and then connect to make sure that everything is working smoothly.
Now you can use Wifi on as many devices as you can. But don’t forget that using too many devices at a time affects the internet speed. You should also name your connection, because there will be many Wifi hotspots showing up every day.