* "My" - You make a fist with your dominant hand, palm facing inward, and touch your chest.
* "Friend" - You sign this with a "C" handshape (pinky and thumb extended) and move it out and down like you're drawing a diagonal line.
Therefore, the full sign for "my friend" is a combination of the signs for "my" and "friend".
It's important to remember that sign language can vary across different countries and cultures. This is just the way it is signed in ASL.