any recommended app for reading & writing pinyin chinese words in txt msg? thx

Hi guys, need help. Now my phone no screen autolock, can i ask how & where i find a default screen lock (im not looking for the pattern screen lock, the 1 i use is 1 slide key lock) or screen auto lock setting? I search all over setting menu & i cant find such setup. Guess i had miss something so hope can get advice here. Thx