I need to be able to create a pop-up/slide in window if

I need to be able to create a pop-up/slide in window if a visitor clicks a link to an external site warning them that the host site is not responsible for content in the site they are linking to, because we ('the client site') are regulated by the FCA.
So it's not a marketing message but a "disclaimer.

Is this the right plugin to use for this? Will it allow me to do this?