To add links to images you will need to go to your admin area and follow the steps below. 

Firstly, go to BlockLab:


Then Click Homepage:


Find the image you want to add a link to and click to select it:


Along the top of the page, click Image, and select Link: 



Select your link type and destination from the available options and click Save:

Finally click publish in the top right to update the link on the front end: