You can open CRM system then follows these steps:
1. SETTING>>SOLUTIONS>>Then you can select solution created by you. See the screen shot.
2. Click the opportunity then click the chart of this form then select any chart. See the screen shot below. Then open new window see the point 3.
3. You can select view then click Arrow Button
4. See the screen shot. Below
5. Select any option for example “Est.Close” for edit view.
6. If you want to change Horizontal Axis label. Then click arrow+button. And select any options.
7. Select chart then click Publish All Customization. See the screen shot.