I got lots of answers to my question recently,
Does this forum have a facility to thank respondents or add them to a friend list? I did not see one thanks
There is no thank or like button like the other forums out there, a simple written thank you should be fine. Since you can't give merits for helpful and constructive posts, you can always ask these users for their bitcoin address or check their profiles and tip them a small amount of BTC If you feel like it.