If your friend doesn’t have the App yet, use your influence: tell him or her to install it (it can be dowloaded from the Apple Store for free in a few seconds). Once the App is open on both devices, a connection will be established automatically (via Bluetooth or Local WiFi). As soon as you see the name of the other device on the upper left of your screen, and the "drag up to click" hint on the middle of it, you are ready to go.
Before dragging, you can add a short message to go with your Click (write your memo in the text field on the silver shape). Drag the silver shape until you you see it joining the golden shape above (you will hear a Click). Your friend will also see the shapes joining (and hear them clicking) on his iPhone: just wait for him or her to accept your Click.
People clicking with their friends will also transfer any Click that they received before. From person to person, from place to place, your Click (and your memo) may get very far away. You also have the option to just transfer clicks you have received without starting your own new path (just double tap on the silver shape to flip it: when flipped this way, it will only transfer received clicks; flip it again to turn to normal mode).
By rotating your device landscape, you will see all paths you have started with your Clicks, and all subsequent Clicks (the steps on the path) pinned on the map. You can select a path and move along it to see all the places where your Click has been. Following any path up to 1.000 Km from it's origin is free. With the "Unlimited Mileage" option, you can follow them to the end of the Earth!You can also use the companion App on the Apple Watch to quickly check the clicks you are holding, the number of paths and steps you have started and your top twelve longest paths.