editing Visual web part using sharepoint 2010

Dear all,

I just want to know - how we can edit the visual webpart in visual Studio 2010 and update the solution back to the sharepoint 2010.

Somebody had done this webpart in visual studio and deployed it in the server. i could not find this webpart solution in visual studio.

Now my job is to modify this webpart and upload it back to the sharepoint server using Visual Studio 2010.

Any inputs is helpful.

Cheers

sathya