Triggering a scrolling text from off screen at the start of an effect

Hi!

I’m trying to make a scroll text (cable news style), that goes from the right of the screen to the left.
The text is quite long.

I found this topic on the forum:

[Continuous Scrolling Text (Cable News Style)]

and Raganmd’s anwser does almost what I need. My problem with this solution, is that I can’t control when the text starts to scroll.

I am currently making an effect that I trigger with a button. I’d like the text to start appearing from the right of the screen at the same time as I trigger the effect with the button. I can’t figure out how to do this.

Can anyone help me?

Thanks in advance !