If you are using PC, open the file: Adding Simplified Chinese Pinyin Input in Windows 7.doc
If you have a Mac, open the file: how to add Chinese to mac.docx
If you have an iPad, open the file: how to add Chinese to iPad.docx
If you do not have Microsoft Word or the above methods do not work, you can type Chinese or Pinyin (with tones) using the following sites:
Google Doc - click this link for a short YouTube tutorial on how to type characters and Pinyin on a Google Doc.
MDBG - Type Chinese in Simplified characters or Type Pinyin.
Google Translate - The left box must be in Chinese with 拼 box clicked. Type out Pinyin in full lowercase, a few words/phrases at a time.