As well as the tag list for insertion of commonly used text you may also assigned key combinations to do the same task. You can edit them via Settings->Preferences and selecting the Keys item.
To add a new key combo type the combo you want, or click the Grab Key button which will wait for you to press the combo and insert the text in the New key combo entry. The Action/Text entry is where you either enter the text that will be inserted upon pressing the key combo in the editor, or you can select a specific action to be performed from one of the preset options. When you are happy with the combo clicked the Add button.
To update a key combination click on it in the list, then edit the information as per adding a new key combo. When you are happy with it click Update, or if you decide you want it to be a new combo you can also click Add
Should you decide that you no longer want a specific combo select it in the list, then click on the Remove button.