Answered How do i get access to an addon that I created on modx.com extras section?

If you're logged in here, go to modx.com/extras, and search for your extra, you should see the option to submit a new version in the upper left sidebar.

There are two settings for the version. One is "requires" which is the minimum version necessary. The other is "Supports Up To," which is the maximum version. Leave the second one blank if you want it shown to people with future versions.