Important: You must open Fleaflicker in a web browser (not the mobile app) to find your League ID and Team ID. These IDs are visible in the URL when you navigate to your league and team pages.
Navigate to your league page on Fleaflicker. Look at the URL in your browser's address bar. The League ID is the first number in the URL path.

Example URL: https://www.fleaflicker.com/nfl/leagues/[LEAGUE_ID]
The first number in the URL is your League ID
Click on your team name to go to your team page. Look at the URL again. The Team ID is the second number in the URL path.
Example URL: https://www.fleaflicker.com/nfl/leagues/[LEAGUE_ID]/teams/[TEAM_ID]
The second number in the URL is your Team ID
On the Create New League page, select "Import from Fleaflicker" and enter both your League ID and Team ID. Click "Create League" and your roster will be automatically imported from Fleaflicker.
If your URL looks like this:
https://www.fleaflicker.com/nfl/leagues/207080/teams/1376512