Aaaaargh

Help.  Does anybody that uses blogger know how to write posts in other tabs on the same blog?  Take my blog for example, I can happily produce posts under the first tab but I cannot write anything other than the first post in the other tabs.  If I click on away days, then click on new post, type something that then comes under the first tab, not where I want it.  I am not the smartest and I am sure I am missing something very obvious, I just can't bloddy see it!!!!  Any help would be fantastic.