An RSS reader is quite complicated. First you need to download the XML file, then read all the tags and present the content in a user-friendly interface.
What do you mean by "sliding up and down"? You can save the Y property to a variable at the MouseDown event, and then compare it to the current value of Y in the MouseMove event. For example:
If Y > DownY +100 then MsgBox ("Slide Down")
If you want to slide an image across the screen then it must be drawn on the form.