For the status update you have configured above, that will only post to the user's wall when they register. When they return, a wall post will not be made. We'd recommend you keep it this way, so as not to annoy your users, but each site is different.
If, with those settings, you're not seeing the wall post at registration, check:
1) The "Require Status Update Permission:" setting is enabled in the "Permissions" tab of the Configuration area
2) That the URL and Picture URL above are valid. If not, Facebook may reject the update. You may also want to test with those removed altogether.
Finally, for seeing other user's, you won't become friends with them automatically just by them joining your site, so you aren't guaranteed be able to see their wall after they join. However, if you click on the "User Map" tab within JFBConnect, you can see all the user's that have joined their Facebook account to your site, with a link to their FB profile.
Hope that helps,
Alex