How to thank a member for a useful post.

Hi, many times i´ve read solutions that have helped me and would like to thank the member who posted it but i cant since i dont see a button for it. Can anyone tell me how to do that? I want to show my appreciation to members that help me. Thanks.

via Welcome to gsm-tips http://forum.gsmhosting.com/vbb/f57/how-thank-member-useful-post-1729609/