XF 2.0 Request (from html page) to a function on the server after entering parameters

[canina]

I created a function in PHP, and I want the client to come to her at the click of a button.

(<xf: callback> gives access to the function and the option of sending parameters, but it reads the function as soon as the page is loaded, and I need to call the function only after there are parameters that are entered by the user.)

Also the form sent to the server is good. Only I do not know how to configure the router on the server.

Many thanks in advance