How to locate my ad after I've posted it & How to cancel when item is sold

This is a GREAT site, but I use it just often enough to get confused on some of the simpler tasks. I'll blame my computer illiteracy. My 2 part question is:
1) How do I locate my ad when I log in on days after I have posted it?
2) How do I cancel it when the item is sold?
Thanks & keep up the good work