You can either search for a snap by typing snap search <packagename> in your terminal and install using sudo snap install <packagename>, or by going to a frontend website such as https://snapcraft.io, finding the package, clicking on "Install" and copy/pasting the terminal install line there. All this, after installing snapd (not sure if it comes pre-installed or not).
Software center does not have snap integration yet. It will after they rewrite it, which is going on right now.
