Posts you write matters a lot on driving organic traffic to your forum. Do not wait for lingering members to create searchable posts for your forum. Members always are lazy on writing on forums. They write few sentences that have less meaning to search engines. Remember "content is a king"
Take time to create posts that you think people from your area are searching for. Example write every hot news in your country or world in general. Your post should have atleast 600 words or 300 is not bad. Put keywords on the tittle and middle and last sentence of your post (thrice per post) that you think people will be writing on google " Example 'president Obama visits uk' check photos click here.
Also take time to learn online about how to create searchable post or google friendly blogger posts. submit your post link to social networks and if possible and allowed submit it to pingfarm. This will make your post to be indexed by google very fast but avoid to much copy and paste from other online sources you will be penalized by google and your site ranking will decline hence you loose many visitors from google man.
Once you win google you will also win other search engines like yahoo, ask and more.
I am not an engineer but I learned this online and It works 90% on my site
Thank you so much for all that info pal , very helpful.. I got all my members from FACEBOOK and Twitter I am lucky to have the time and the know how to do that.
How do I make a google friendly forum then what do I need to do .. Like got any tips pal