... the sub-menu, press Menu key once2. Press #key to capital letters. (ABC On the LCD, meaning capital letters)3. Press 2key 3 times, C ... is ok;Then, press 6key 1time, M is ok;Then, press 6key 2 times, N ... the LCD, meaning number)3. Press 2key 1 time, 2 is ok;Then, press 3key 1time, 3 is ok;Then, press 4key 1 time, 4 ...