I just tried everything I can and looks like I cant change the color unless full forum colors are messed up with. I have left a comment to theme author at Vbulletin theme thread. I will get back to it if I get a reply there.
Thanks you all for the useful info, and thanks Ash and Avi for trying to get the problem fixed and your suggestions. One of the issues I have is sometimes if I try to copy and paste a URL or even text the whole reply gets highlighted when I right click and you cannot paste without messing up your whole post. For Alpha's recent review, I tried to copy and paste his review that he sent, but when I did, the whole article got jumbled up and it took me a very long time to format and fix it to the way Alpha wrote it. I never seemed to have these problems before until recently. There may be nothing that can be done at this point if it is vBulletin issue.
The link color is changed now, but it came with sitewide color change. May be you wont notice.
It's noticeable avi bro. Thanks for the update