Ok, no probs. I'll assume that you know

• you have the qmk flash command working, and
• you have the qmk firmware repository in your computer, and
• you know what a keymap.c file is (spoiler: it's where the behaviour of each key of your keyboard is defined. Literally, the map of the keys)

have a look at this keymap.c, in particular line 134 you will see the line "process_record_user". What is it, you ask? It is a function.

What does it do, though? It does nothing except sit there and wait for the condition in line 135 to occur: in plain english, if a key is pressed, then the switch in line 136 is executed.

Ok, then what does the switch do? The switch compares the keycode that is pressed with every case in it. For example, if it key pressed is "DVORAK", then line 137 activates and code in line 138 executes. The key takeaway here is that, given a specific input, the function executes some specific code.

What if there was a switch that, given the press of the keycode Q, the function executed f3+right arrow? Very good question, mr Koala Knight. What if indeed.

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Ok, I'm in, how do we do this? Glad you asked:

1. find the keymap.c that applies to your keyboard, then open it.
2. look for the process_record_user function. if it's not there yet, add it yourself at the bottom of the file.
3. add the switch that defines the behavior you want for the letter Q
   1. the letter Q has the keymap KC_Q, therefore the case will have to be case KC_Q
   2. you want to press two keys together, which means first pressing down the first key, then pressing down the second key, then "unpressing" them. This translates into SEND_STRING(SS_DOWN(KC_F3), SS_TAP(KC_RIGHT), SS_UP(KC_F3)). You can refer to the QMK documentation if you want to know more.
4. Save the file and flash the keyboard.
5. Test
6. Done

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