Use a touch screen pen which can be used on mobiles - example is https://www.amazon.ca/LifeFan-Stylus-Precise-Double-Replacement/dp/B07FJXMMRP/ref=sr_1_2_sspa?keywords=touch+pen&qid=1582856109&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUE0ODI4QVc0RTJaT1QmZW5jcnlwdGVkSWQ9QTA4NzIyMzAyNkJTNlFPMk5KREZBJmVuY3J5cHRlZEFkSWQ9QTAzMjYwMTkzM1lSTDRVSjFJOE82JndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Notice the wired gauze portion on the back. That works on touch screens.