Edit the data.txt file that is included. You HAVE TO edit data.txt in order for the module to work. Also it is a MUST: maximum 500px height OR maximum 330px width. You can use for every picture simple html tags for the description (like ... , ... , .
Upload all the files (including your portfolio's images) and then install the module through the XOOPS admin interface like any other simple module. Done
When you have more pics you will only change the data.txt file and then upload your images in /images directory of the module.
That's about it ... I think I covered it all. Hope so