Once you have copied a Google Form to your Google Docs, you may edit it.

Open the Sheet that you copied.

Click Form > Edit form.

This opens the form in a separate window for editing.

Edit Form Name: Click the form name (upper left side). You many rename it by typing here.

Edit Questions:

To edit questions, select the questions tab at the top of the form, then click the six dots that appear when you hover your mouse over a question.