As already stated, there is a 'rocker switch' along the upper right side of the iPad2 - if you tap the top or bottom of the switch, then the volume window appears on the screen and can be adjusted - not sure if that is your question or whether you want the volume to show up permanently on your screen? Let us know!
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.