When logged into the web page, go to Photos in the main menu on the left side of the page.
To share one photo or video, click the photo you want to share, then select "share" from the bottom right menu.
To share several photos or videos, select the photos you want to share by clicking the checkboxes that appears when hoovering the photos. Then select "share" in the bottom menu.
To share an album, start by going to "Photos" in the main menu. Then click on "Albums" in the photos navigation bar at the top of the page:
Click the album that you wish to share
Select your preferred way of sharing the album, you can select to Share