You'll need to use CSS to change the design of the userlist. You can also edit the template PHP file directly. For template paths please see your documentation. We do not assist with cosmetic changes, this is for you to do. If you do not know how given the context of your posts you need to higher a web developer.
what will it cost if you make the changes for this on my site...
We're not a contract development site, please go to Joomlancers or other relevant sites. You can also make 3rd party development requests within our 3rd party development boards. Any further threads with such requests will be removed or moved.