Want to implement SSL - https

[Dave]

1. Implement and install the SSL certificate.
2. Change the vBulletin URL's in the settings.
3. Apply appropriate rewrite rules to redirect HTTP to HTTPS, 301 if you plan on using it forever.
4. Install one of the available image proxy plugins so images from a third party hosting provider are proxified through HTTPS.
5. Change any embedding BBCode you have to use the HTTPS scheme.
6. If some of JS/CSS files of vBulletin still load over HTTP, apply some modifications to the templates to forcefully load those over HTTPS.

That's what I had to do to make HTTPS work on my forum.