Hi ofeliagonzalezuhlyhg, welcome to Thunkable! 
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Are you wanting the text entered on the text input to be visible on different screens? Variables are the way to do this generally if you are only using a few of them. If you’re going to start having many inputs and wanting to collect that information, a data source may be a better option. You can see more information about that, including tutorials, in our docs.
If you’re going to stick with variables, you can have whatever text is inputted into the text input saved as a variable. When you want to retrieve that data, you can use a label and set its text to the variable you collected earlier.