uninstall a programme

Be a bit more specific : How did you install it ? How did you try to remove it ?

Try to use Ubuntu Software Center to select your software and remove it.

Alternative : use Synaptics to find out the package you installed and remove it.

I tried yo uninstall by UBUNTU software center . But it did not work. I am very new in UBUNTU . Please tell me manually.
I really forget how I installed it.

If you want an answer please don't set your question into a solved state

New to Ubuntu: read the Ubuntu Manual, it's very informative: http://ubuntu-manual.org/
Click on the "download Button" to download the latest PDF version.
The online help https://help.ubuntu.com/10.10/index.html

Need help with Unity interface:
http://www.omgubuntu.co.uk/natty/#what
http://theravingrick.blogspot.com/2011/04/my-effort-at-writing-help-for-unity.html

I still can not uninstall it and it bothering me every time I log in my computer.
In UBUNTU software center there is no any software named keyring.
Exactly what is this I can not estimate. the notice appeared I am providing bellow. Please help me as I am really new in UBUNTU.

Enter password for keyring 'Default' to unlock
An application wants access to the keyring 'Default', but it is locked

Open the ubuntu software centre. Then in the search box type keyring.
At the bottom of the list there is a hyperlink saying 'Show Technical Items', click on this and the keyring application should appear in the list.
Click on the app and select 'Remove'

By the way, I would perhaps advise against removing it as some other apps, such as email, may be using it to manage your passwords. If you remove it you may have problems with other apps.