Hello I am trying to unnistal popper but it is not possible because it does not appear on in my extension manager list
my joomla is 1.5.25 and the reason i want to unnistall has nothing to do with the module, it is working perfect.

I just installed the module and uninstalled it. I am not sure why yours did not uninstall; whether you do not have the 'know how' or some other factor.

Anyways, here are some quick instructions to uninstall a Joomla module(in this case popper) with Joomla 2.5:
1) Login to admin
2) Select Extensions >Extension Manager >Select Popper >Select Uninstall in the menu near the top.

Alternatively, you can always manually uninstall a Joomla module(for any Joomla installation) by deleting the desired module folder that exists within the modules folder.

Chuk