i do you get to see other people friend codes to add them 0.o

If I understand what you are asking correctly,
You click the Blue Wi-Fi button at the top right corner of the post of the person who's friend code you want. (you can also do this on their profile)
It sends a request to that user.  If the user accepts, it adds the friend code to your registry.

You cannot post your friend code or ask someone else for theirs without using this.

ok thanks but how do you know when you have a request ?

You'll get an alert in My Alerts, the same area where flagged thread alerts, private thread alerts, etc. show up. It should say # FC Requests.

thakns man