How to edit content of sharepoint in visual studio 2010

Question

Hi Guys,

 

i have to make changes on the Sharepoint2010 UI. suppose say, my site name is http://demosite/sites/pages/default.aspx. on this perticular site i have a series of tabs. on click of particular tab, it opens two sections on the same page i.e default.aspx. i have to add one more section appending with the existing sections. 

 

i don't have complete knowledge on sharepoint. when i searched on net people have advised to open .wsp through sharepoint solution package. when i searched on iis there is no wsp for this application, please advise me on how to edit this particular section. also in the solution , i didn't any wsp

 

i believe this is definitely a web part deployed in sharepoint.  

 

Regards,

Sivaprataap.