You can check out the numbering in the diagrams of this article, and once can adapt it to the model B + also will work with Raspberry PI 2 Since the position has been.
Unaweza kuangalia namba katika michoro ya ibara hii, na mara moja unaweza kukabiliana ni mfano B + pia itafanya kazi na rasiberi PI 2 Tangu nafasi imekuwa.