First, there's no such thing as a stupid question! There's only stupid answers... which is what makes my job all the more challenging!
The process is actually quite involved, so rather than explaining it all out on here, I'll tell you how to find it for yourself. If you have your instruction manual from the device, the how to is located in chapter 6 on pages 24 and 25.
If you no longer have the manual you can look at a .pdf version of it by following the below directions.
Click this link, or copy and paste it into your URL bar:
Click "Download Centre"
On the drop down menu's fill them in order and with the selections below:
and then click the button that says "User Guide and Manual" then Go
The second link on that next page is for the manual, click that one.
The next page looks quite overwhelming but you're looking for the second underlined option that has the text Quick Start Guide and says pdf at the end.
This will open a window with the guide in it, just jump to the above mentioned chapter and pages and you're good to go.
I hope this helps!