[support] populating a user reference field

Hello Guys,

I have created a couple of roles employer and job seekers. The employer can create a content I called job-post and the job seekers can view these content. I have also included a user reference field in the job-post content that will hold the job seekers that will apply for the job-post. I am using D6. My questions would be:

1. How do I add a button on the node view of the job-post content so that when the job seekers view it they can apply and their record will be added on the job-post node? 2. After I have added the button how can I programatically add a record to the user reference field?

I looked at panels, rules and webform it seems that these modules cannot help me.

Thanks

Richard