Flippr for Flickr uses a “sliding drawer” main menu (same as Gmail or Yahoo Mail). To show the main menu, tap on the left side of the title bar (see the 3-line icon in the image below).
Practically every view in Flippr for Flickr has an action bar at the top. Depending on the device and the available space, some of the options are grouped in the “overflow menu”. To show the overflow menu, you have to tap on the “three-dots” button in the top right.
To load faster, some of the content may be split in pages. You can always go to the next page by tapping on the “Next” button in the action bar (right-pointing arrow), as shown in the image below. Sometimes, if the space is limited, the paging buttons may be in the overflow menu.