URl and Welcome-program

Hi there!
Please, tell me
URL. I can’t building URl with URL’s constructor for card details. Finally success: the user moves to the required card from one table to another, but there are two problems: 1) the link with Row ID does not work 2) it is not clear how the link can be passed to another table.
Welcome-program. It is necessary to acquaint the user with the app, telling in detail about all its functions. I want to give hints that helped in this.
Does anyone have such experience?

Closing, duplicate of URl: please,help