[SOLVED] How to create a link to (a website) button in the sidebar

Dear people,

On my website I created two menus (left and right).
In the right menu I installed the search option, social sharing toolkit and a button (under widgets I placed them under right sidebar).
With regard to the button, I first made a "page" from it in Pages and applied this as an image in a page. Thereafter placed it under the right sidebar under widgets.

My website is: http://www.noordzeeresidence-cadzandbad.nl/

My question: How can I create a link (to another website) to the button in the right sidebar?

I hope someone can help me with this.

Warm regards, Marcel