How do you activate the vertex in astrology?

Excuse me, but I'm a bit confused about your question. Firstly, astrology is a study of the movements and positions of celestial bodies, such as stars and planets, and their perceived influence on human affairs and the natural world. It does not involve activating any "vertex" as such. However, if you're referring to a specific astrological technique or concept that I'm not familiar with, could you please clarify what you mean by "activating the vertex"? Is it a term used in a particular astrological tradition or system? Or perhaps you're asking about a metaphorical or symbolic interpretation of the term? Without more context, it's difficult for me to give a direct answer to your question. But I'm happy to discuss astrology and its various techniques and concepts in more detail if that would be helpful.