If your posts aren't appearing on Tumblr-wide tag pages, it might be because your blog is pretty new and we need to make sure you’re not a robot or a spammer. Make sure you’ve verified your account via the email we sent when you joined Tumblr. Once you’ve used your account for a while (and done normal, human things with it like follow other blogs and like or reblog posts), your posts will start appearing on tag pages.
If you are a robot or a spammer, you should visit our article about account deletion.