How to adjust the exposure time of iphone6 mobile phone?

1. First turn on the camera function of iphone, as shown in the figure below.

2. Then in the open page, open the live mode, as shown in the figure below.

3. Then take a photo, select a photo and slide it up, as shown in the figure below.

4. At this time, you can see that there are many options below, as shown in the figure below.

5. Finally, slide to the right to see the long exposure mode. Just click it, as shown in the figure below.