There are two types of trademark symbols that might be used in a document. The first is the super-scripted "TM," which denotes a trademark that has yet to be registered, and the other is the super-scripted encircled "R," which denotes a registered trademark. Most university style guides require the use of the trademark symbol on the first use of a trademarked name in a text, but others do not require its use at all in a body of text. It is always required when the trademarked name is used specifically for profit or gain.
Place the cursor next to the word you want the symbol to be on. Do not leave a space.
Type the characters "(r)" at that location, or "TM" if you are doing an unregistered trademark. Most word processors have an internal code that recognizes "(r)" and converts it to the registered trademark symbol, but it does not automatically super-script the symbol. If it does not convert it, you will have to find and insert the symbol in your word processor's "Insert" function.
Highlight the symbol or the "TM" and change it to super-script. Most word processors have a button on the toolbar that will do this. If not, you will have to go into your word processor "Font" function to superscript the symbol.