I know I am missing it some where but I have clocked on everything I can think of to show that an issue was solved.
The easiest way to indicate that your problem is solved is to add "[SOLVED]" to the thread subject. Provided you're the original thread's author it is easy to do. Go to the very first post of the thread Modify the first message You should see the "Subject" of the message. The subject defines the subject of the thread. Simply add [SOLVED] to the beginning of the subject (leave the rest of the subject as it is). Hit Save.This procedure can also be used to fix typos in the thread subject if you later notice it has spelling mistakes.