The best way to promote your website on any forum is to focus 100% of your attention and energy to helping people for free.
Example; if you look at my profile you see I answered thousands of questions on Quora, giving freely of my time and talent. This has inspired Quorites to click my blog link to visit my blog. I promoted my website by sharing my knowledge, or by promoting my expertise for you.
If you share value on forums, members see you as being valuable and will click through to your website.