i dont have owner apple id now how can i activated my i pad because i purchages secnd hand i pad

Contact the seller. They need to disable activation lock. If they can't or won't try to get a refund as you cannot use the iPad. -AJ

Directions for seller:Turn off Find My iPhone Activation Lock - Apple Supportand What to do before selling or giving away your iPhone, iPad, or iPod touch - Apple Support

Information about Activation Lock: Find My iPhone Activation Lock - Apple Support

you can show up in an apple store with proof of purchase otherwise you can't do anything