MathKey can be found in the Soulver preferences and can be used to replace the character that is inserted when a key is pressed on your keyboard.
For example, you might prefer the traditional times symbol (×) to the * (asterisk) symbol. With MathKey, you can cause the keystroke shift-8 to insert × instead of *.
Go to the "MathKey" pane of the Soulver Preferences.
Click on the plus button (+) to add a new MathKey.
Double click the keystoke field and enter your keystroke. If you want to use a key like shift with another key, press it at the same time as you press the key.
Double click the insert field and type the character to be inserted (ie ×).
Tips
MathKeys can be disabled by unticking the "On" checkbox.
We find it's great to put + (plus), on the more convenient ` key.