How do you link a button to send an email button with app inventor?

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Problem with contact form

Hello everybody! After consulting all the information you have provided me, I made the contact form like this: [EmailForm_interface] [ContactForm_programming] When the people click "submit", Gmail will open and they will be able to send the email. Then, Gmail will be close to go back to the app. What do you think about it? However, I have a doubt: in the block "join", in the last string, instead of Gabriel I would like it to show the name that the user writes in the textbox "Your name...".…