To find out your SteamID64, click on your name in the top right-hand corner of the Steam client and then on Account details or open the page in your browser.
In the account details, the SteamID64 is directly at the top under his Steam name.
To find out your SteamID64, click on your name in the top right-hand corner of the Steam client and then on Account details or open the page in your browser.
In the account details, the SteamID64 is directly at the top under his Steam name.