Select Text under Element Properties on the left side of the screen. You will see a new element pop up on your device view.
On the right side of the screen under Element Properties, enter the name of your element as well as a description if necessary. To make the information required in order to submit the form, scroll down and select, Required under Element Properties.
If you want to allow your user more than 50 characters use the Text Area element or change your Data size under Element Properties. Delete the default of 50 and input your desired number. To make information required in order to submit the form, scroll down and select Required under Element Properties.
Click the save icon at the top right corner of the page.