Need to trigger another plugin's function in Ajax Infinity

Hi.
I'm using a modal plugin in a blog (Regular Labs Modals plugin). I need to trigger this plugin initialising function after Ajax Infinity loads new articles.
Where (in what file and in what line of code) do I have to put this triggering code?
Thanks !
www.arnaudgautron.com/fr/blog (still under development) -> Modal works fine in first article, not in second one.

That would qualify to custom development, but try api.jquery.com/jquery.getscript/

OK. Thanks for the answer.
What to do to get custom development ?

I'm not a developer but I'm still trying to do this by myself.
The developer of RegularLabs Modals told me to trigger a specific function after AjaxInfinity has rendered the new articles.
The function is RegularLabsModals.init();
I am lost with jQuery/Javascript and I don't really understand how and where to put it in the AjaxInfinity plugin code. Any help, please?

Hi,

If you contact me on email we can arrange a custom job for this.

Hi. I finally did it on my own.
It was quite easy, in fact: I simply added a call to the initializing function of RLModals plugin at the end of the callback function of Jscroll. Works well!
Thanks.