When I try to set up the slider I can not find how to add the link not to the picture, but to the text. and I don't see how to do it. The link can only be attached to the picture. And it's not convinient
When you need add link to some text to Joomla Slider
You do exactly as when add some text, BUT you need add "HTML text" with tag "a", as example:
This link to best <a href="https://ordasoft.com/joomla-slider">Joomla slider</a>
Please check below Joomla slider documentation
You need add so HTML exactly as you add text points 5,6.