Lastpass on my new mac questions

Hello all,
I just received today a new macbook pro 13 inch I orderd from amazon due to a sale they were having. I am trying to install lastpass and am running into issues. First when I open the app I cannot find the edit fields to type in my username and password. Any one have a suggestion on what I can do? Also I cannot figure out how to install the lastpass safari extension. When the extensions open up in the mac app store lastpass is not there. how do I install this?

Greg Wocher