Dearborn, I just used the bold and URL tags, and incorporated the link in the tag.
Without the [ ] so it doesn't automatically convert the tags to code:
url link /url
url="link" description /url
url="PcgsSiteLink" CertNumberText /url
The first version will just get you a blue underlined link. The forum will convert your link to a pass-through link. The second one is fancier. You can use descriptive text between the url tags. The link code will be embedded and invisible. This is the way you see most links on web sites. The second technique is a bit more work than just pasting a link and letting the forum convert it, but visually it's a tidy result.