In most laptop/netbook/notebook/etc, after removing the screwed-on panel, you'll usually see a small lever. This lever acts very similar to a desktop cpu lever; it's used to lock or unlock the chip. Pull the lever up, and the SO-DIMM sockets should either come up with the lever, or be free to move up with a little tug.
If your netbook doesn't have the aforementioned lever, then usually pulling the sockets up should do.
NOTE: SO-DIMM memory needs to be removed and installed at 45 degree angle, so don't try to get the sockets to a 90 degree angle, or you'll damage the sockets.