To add a link to your Ultimo slide

1. Navigate to CMS > Static Blocks

2. Choose the Static Block that corresponds to the slide you want to edit

3. Wrap the entire content of the slide in a link. 

<a href="#"> THIS IS THE SLIDE CONTENT </a>

Example:

The slide contains this image 

<img src="{{media url="sunshine.png}}" alt="" />

To link this image to https://www.google.com/ , simply place the link text ( <a href="https://www.google.com/"> ) before the content, and close the link (</a>) after the content. 

So, the final slide will look like this:

<a href="https://www.google.com/"><img src="{{media url="sunshine.png}}" alt="" /></a>