When entering text in a text entry field, how do I automatically add a fixed text to the text input?
You can use the Key Up event of your Text Field widget, which will fire on every keyboard key release. So you can add/change fixed text every time the user presses a key on the keyboard. You can use conditional cases to trap for specific keys pressed (e.g., to respond only if key is alphanumeric and not an arrow key or something.)
If you still need help with this, could you upload a sample .rp file and/or provide more details about how you want to add text–e.g., prepend, append.