Click on the Gallery tab at page top
then click the Cursors link
and then the Upload link.
(Gallery > Cursors > Upload)
When you have finished uploading your cursors click to Create a set near the page bottom,
(or Gallery > Cursors > Create a Set).
You must be a registered user and log in.
Here is the link to the cursor upload page.
The same is true for uploading of icons except that you would select Icons rather than Cursors in the links.