instructions update

Author: yarwinliu

content/_index.md

@@ -11,7 +11,8 @@ CVEX is an executable that runs a software exploit and outputs relevant data in
 1. Pull from the GitHub Container Registry (GHCR):  
   a. 'docker pull ghcr.io/ucsb-seclab/NAME_OF_CONTAINER:TAG'  
   b. for example, 'docker pull ghcr.io/ucsb-seclab/demo/client:latest'  
-  c. check each container's README for more details
+  c. check each container's README for more details, and [for help on ghcr](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry#pulling-container-images) 
+
 2. Or (for v2 only): pull from the Github and run as instructed in the README
 
 <!-- ![CVEX](./images/cvex.png#center) -->