Linking Page to a grid list

I have added a grid list on my portal page (as visible in the attached image).
There are 3 blue coloured KNOW MORE buttons in the image. I want to add an action, i.e. when someone clicks on knowmore a new detailed page should open.

As of now I am only able to link a single page to all three categories (sherpa,design & creatvesand Technology). However, I want to link three different pages to the three categories respectively.

Can anyone help me with this