Please try the following steps that can help you customize the press keys of the pen.
1.Open the Bosto driver and click on 'Drawing Settings'
![How to customize pen press keys? How to customize pen press keys?](https://0.rc.xiniu.com/g1/M00/4A/4B/CgAGS2Cssp6AEs9iAAC0opXS2XM599.png)
2.Click on 'Mouse Right Click' or 'Mouse Left Click' for setting as mouse function.
![How to customize pen press keys? How to customize pen press keys?](https://0.rc.xiniu.com/g1/M00/4A/4C/CgAGS2Css0qAa0npAAC9akPA-6s745.png)
3.Click on 'Keyboard' for setting as letter shortcuts function.
![How to customize pen press keys? How to customize pen press keys?](https://0.rc.xiniu.com/g1/M00/4A/4C/CgAGS2Css7WAVrzNAAC7dTeIaT0441.png)
![How to customize pen press keys? How to customize pen press keys?](https://0.rc.xiniu.com/g1/M00/4A/4C/CgAGS2CstDeASCaPAADJTvDNx6c127.png)
![How to customize pen press keys? How to customize pen press keys?](https://0.rc.xiniu.com/g1/M00/4A/4C/CgAGS2CstNSABJ8vAAC007avnhM633.png)