By default all links on blogs and websites are normally do follow. If a link has a "no follow" attribute attached to it's "<a href...</a>" html code it means it is no follow while if a link does not have the term "nofollow" within it, it is do follow. If you are running a blog like Wordpress you can easily find a plugin to change your links from do follow or no follow.
try to check the codes or use tool if the links are in nofollow.. then come back and tell us what cms you are using..