Linkedin Integration on HelloMe for JomSocial and JS Registration

You'd have to modify the template file for the HelloMe module. I'm assuming this would be in the /modules/mod_hellome/tmpl/default.php file. Once you find the location you want to put the Login With LinkedIn button, simply add the tag {JLinkedLogin} and the button will appear there.

Hope that makes sense and helps, but if you need anything else, just let us know!
Alex