Step 1: Start->All Programs->Microsoft Office->open Microsoft Infopath
Step 2: Create are list by click Sharepoint Form Library-> create a form in infopath
3: Once you Created Goto to Home on Ribbon->click Info ->Publish
->Then give the Sharepoint site Url where you are going to publish
that infopath form.
Step4: Click preview you can view the from in brower at sharepoint site.