Sticky notes are like the notes you tack onto your refrigerator or computer. They are just temporary reminders. If you want to be able to save and retrieve a note, then you need a notepad/notebook apps. I have both, one for notes to last for a while and the sticky notes so when I, say, go shopping, I make a list on the sticky notes. I'm not saying that there isn't a sticky note apps that has a save/retrieve function, I just haven't found it yet.
I believe the sticky note widget can only save one, meaning you create a sticky note and save it, after that you edit it to whatever else you want to remember. I am pretty sure you can not have more than one sticky note at a time...