How do you connect your v3 and v4 tamagotchi?

One person goes over to the heart on the main screen and choose it with the (B) button. Select whichever version the other person's is (for example if yours is a V4.5 and your friends is a V4 hit the "V4" link, if your friends is a V3 hit the "OTHERS" link, etc.). Hold the Tamagotchis with the fronts facing each other and have one person press the (B) button. It will say either "SUCCESS" or "FAIL" or something like that. If a success, proceed with sending gifts or playing games or visiting each other. If a fail, make sure that the two Tamagotchis are compatible with each other and try again. If after a lot of tries, if you know that the two Tamagotchis are compatible for sure, then check the batteries on both of them and keep trying. P.S. V1s can only connect to V1s and V5s and V6s can only connect to V5s and V6s. V2, V3, V4, and V4.5 can all connect to each other. P.P.S. Only Tamagotchi Connections can connect at all (hence the name "Tamagotchi Connection"). P.P.P.S. Good luck!