Custom Extension for noobs

[gekster72]

Hi, I am completely new to developing extensions. I have recently came to a desire to make a certain script, which I had succeeded to run at different extension tab (on_ui_tabs()) with help of copy and paste. program is clicking buttons and making a prompt string.
However, I cannot understand how I can send the prompt string Ive made to txt2img XYZ plot X Value. (I am currently using only script.py in extensions tab)
I am trying to study by myself, but I do not know how I can educate myself.
Output image is pushing a button, and the prompt string made will fly to be pasted in X Value....
Can any kind programmer help me...?