How can I click only once on the “add text” button and then add several texts in Foxit Reader?

I use Foxit Reader to complete a PDF form with the “add text” feature. Current I click on the “add text” button, the add 1 text, then click again on the “add text” button, the add a second text and so on. How can I just click only once on the “add text” button and then add several texts (i.e., click only once on the “add text” button to complete the entire form)?