To change the screen brightness on your computer, you can use the following methods:

1. Using keyboard shortcuts: Press the **Fn** key and the **brightness up/down** keys to increase or decrease the brightness respectively. The brightness keys are usually located on the top row of your keyboard.

2. Using the physical buttons of your monitor: If you have a desktop computer with an external monitor, you can adjust the brightness using the physical buttons on your monitor.

3. Using the Quick actions: Open the **Action Center** by clicking on the **Notification icon** in the bottom right corner of your screen. Then click on **Expand** to see all available options. Click on **Brightness** and adjust it as needed.

4. Using the Settings app: Open **Settings** by clicking on the **Start menu** and then clicking on **Settings** (gear icon). Click on **System**, then click on **Display**, and then adjust the brightness slider as needed.

5. Using Windows Mobility Center: Press **Windows key + X**, then select **Mobility Center**. Adjust the brightness slider as needed.

6. Some PCs can let Windows automatically adjust screen brightness based on the current lighting conditions. To find out if your PC supports this, select Settings > System > Display. Select Brightness, look for the Change brightness automatically when lighting changes check box, and then select it to use this feature.