How do I create the same login system like the one you are using on your website.

Hi there, I would like to incorporate the same method you are using to let members login, into my own site.

I also like the little tag on the menu bar that is used to let members login.

I have been trying to accomplish it, but tbh I am having some trouble doing so - maybe I am not using the correct plugins and or settings.

Could you kindly guide me to achieve the same effect?