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I'm afraid that I am not entirely sure what way of pasting text do you have in mind.
If you are looking to paste some text into your header, you can simply add a Heading field, and click on the Click to edit this text... and you will be able to paste your text in there.
You can do the same for the Text field as well.
If, on the other hand, you are looking for a way to copy/paste data that they have entered in another field, and have it show up in the text as well, that is also possible with JotForm.
You can do this in two ways.
1. You can use a Text field (1), and paste the Name of another field inside (4). You can get the name of another field by right-clicking on a field and selecting Show Properties (2), than look at the bottom of the popup for the Name of the field (3).
2. Alternatively to the above, you can also use Conditional logic to update a field value based on what is entered in another field.
This will allow you to update the value of any editable / inputable field, in which your users are entering data, but it will not allow you to update text of the Heading or a regular Text field.
Please let us know if you need further help or clarification on this, we will be happy to help.