Open Google Photos (https://photos.google.com/) and sign in.
Left-click on the "Albums" icon.
Left-click on the album that you want to share.
Left-click the "Share" icon at the top (looks like 3 dots in a triangle with 2 lines joining them.
Left-click "Get link".
Copy the link that gets generated (Control-C).
Paste (Control-V) the link into an email.