Installing Facebook page tabs?

[G3DW]

I'm trying to help our local dog shelter start a Facebook page so that they can create more awareness and gain more donations and volunteers. I want to add different tabs to include pics and details of re-homed dogs, puppies for adoption, volunteering, donations etc. But I can't figure out how to do that. Can you please help? Also are there any Facebook apps useful for non-profit organizations?

If I'm not making myself clear please check out the tabs of this page which I'm taking as an example. https://www.facebook.com/adoptadoginsrilanka

Thank you for your helpful answers.