What are Kudos?
"Kudos are a way for you to give approval to content that you think is helpful, well-formed, insightful, or otherwise generally valuable in the community." - Tony_Weiss. More information about Kudos can be found at this link.
Click the Kudos Star 
After you kudo a message, the + sign will change to a √ mark as confirmation that you awarded Kudos: 
Was your issue resolved?
If you are the author of a thread and your issue was resolved, select 
on the post that best answered your question. Only the thread author has this option.
This really does help others when searching the forums for answers.