To find the Steam ID of your friends, follow the steps below:
1. Head to Steam, and copy the custom URL of your friend.
2. Click here, paste the URL, and search for your friend's username.
NOTE: If your friend is set to Private or is restricting their Steam info, they may not appear in the search)
Once you find the ID, copy and paste the Steam64 ID (which should be a string of numbers).
3. You can now plug that ID into the Match History search bar to search for your friend's matches!
To find a friend's Riot ID in League of Legends, simply log into the game, hover over their profile picture in the top right corner, and their Riot ID will be displayed
An example of this may be your friends Riot ID in League being allstar#XYZ
Questions? Feedback?
Let us know at support@allstar.gg!