You can get your card symbols via Insert > Symbols > Symbol > Font > Scroll to Symbol.
Locate the required symbols and either d/click to insert, or select > Insert.
Alternatively, you can press the
Numlock Key, then press the
Alt + 3 keys for a
Heart, the
Alt + 4 keys for a
Diamond, the
Alt + 5 keys for a
Club and the
Alt + 6 keys for a
Spade.
Note the symbols are are little different when using the keyboard method.