I just received my Raspberry PI and had a few problems configuring the static IP on the wireless connection. I use the Wi-Pi official WLAN USB module and I really need to use the Raspbery PI without ...

That Raspberry Pi IP we found earlier (in Step 1) may work for now, but there’s no guarantee your router will keep assigning the same IP address to your Pi forever.

What Is a Static IP Address? (unknown) Instead of letting your router assign whatever IP address is free at any given time, you can assign specific IP addresses to the devices you access frequently.